Deuteronomy 21:15-17 · Bible study
Deuteronomy 21:15-17 Commentary: The Unchanging Right of the Firstborn
Hebrew · 11 what the commentators say
Meaning in one sentence
Why God's law protects the firstborn's inheritance from favoritism, even in a polygamous family. A study of justice and order.
Research Summary
- Meaning: A father must not transfer the firstborn's double portion to the son of his favored wife; the birthright belongs to the actual firstborn.
- Key words: Hated (שְׂנוּאָה, less loved), firstborn (בְּכוֹר), double portion (פִּי שְׁנַיִם, "mouth of two"), beginning of his strength (רֵאשִׁית אֹנוֹ).
- Main debate: Whether this law addresses concurrent polygamy (most commentators) or successive marriages (Jamieson-Fausset-Brown).
- Theological theme: God's justice protects the vulnerable from arbitrary human authority, even within flawed family systems.
- Best use: Teaching on God's concern for order, the limits of paternal power, and the value of every person regardless of parental favor.
Translation Comparison
BSB Berean Standard Bible 2020
15If a man has two wives, one beloved and the other unloved, and both bear him sons, but the unloved wife has the firstborn son,
16when that man assigns his inheritance to his sons he must not appoint the son of the beloved wife as the firstborn over the son of the unloved wife.
17Instead, he must acknowledge the firstborn, the son of his unloved wife, by giving him a double portion of all that he has. For that son is the firstfruits of his father’s strength; the right of the firstborn belongs to him.
WEB World English Bible 2000
15If a man has two wives, the one beloved and the other hated, and they have borne him children, both the beloved and the hated, and if the firstborn son is hers who was hated,
16then it shall be, in the day that he causes his sons to inherit that which he has, that he may not give the son of the beloved the rights of the firstborn before the son of the hated, who is the firstborn;
17but he shall acknowledge the firstborn, the son of the hated, by giving him a double portion of all that he has; for he is the beginning of his strength. The right of the firstborn is his.
KJV King James Version 1769
15If a man have two wives, one beloved, and another hated, and they have born him children, both the beloved and the hated; and if the firstborn son be hers that was hated:
16Then it shall be, when he maketh his sons to inherit that which he hath, that he may not make the son of the beloved firstborn before the son of the hated, which is indeed the firstborn:
17But he shall acknowledge the son of the hated for the firstborn, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the firstborn is his.
ASV American Standard Version 1901
15If a man have two wives, the one beloved, and the other hated, and they have borne him children, both the beloved and the hated; and if the first-born son be hers that was hated;
16then it shall be, in the day that he causeth his sons to inherit that which he hath, that he may not make the son of the beloved the first-born before the son of the hated, who is the first-born:
17but he shall acknowledge the first-born, the son of the hated, by giving him a double portion of all that he hath; for he is the beginning of his strength; the right of the first-born is his.
YLT Young's Literal Translation 1898
15`When a man hath two wives, the one loved and the other hated, and they have borne to him sons (the loved one and the hated one), and the first-born son hath been to the hated one;
16then it hath been, in the day of his causing his sons to inherit that which he hath, he is not able to declare first-born the son of the loved one, in the face of the son of the hated one--the first-born.
17But the first-born, son of the hated one, he doth acknowledge, to give to him a double portion of all that is found with him, for he is the beginning of his strength; to him is the right of the first-born.
Darby Darby Bible 1890
15If a man have two wives, one beloved, and one hated, and they have borne him children, both the beloved and the hated, and the firstborn son be hers that was hated;
16then it shall be, in the day that he maketh his sons to inherit what he hath, that he may not make the son of the beloved firstborn before the son of the hated, who is the firstborn;
17but he shall acknowledge as firstborn the son of the hated, by giving him a double portion of all that is found with him; for he is the firstfruits of his vigour: the right of the firstborn is his.
Douay-Rheims Douay-Rheims Bible 1899
15If a man have two wives, one beloved, and the other hated, and they have had children by him, and the son of the hated be the firstborn,
16And he meaneth to divide his substance among his sons: he may not make the son of the beloved the firstborn, and prefer him before the son of the hated.
17But he shall acknowledge the son of the hated for the firstborn, and shall give him a double portion of all he hath: for this is the first of his children, and to him are due the first birthrights.
Verse in Context
Original Language (Biblical Hebrew)
Old Testament · Biblical Hebrew · Deuteronomy 21:15
Source: STEPBible TAGNT/TEHB (CC-BY 4.0). Click or tap a morphology code to see the full parsing.
Scholars' Consensus
Commentators across traditions agree that Deuteronomy 21:15-17 protects the firstborn son's inheritance from a father's partiality. John Calvin calls it a supplement to the Eighth Commandment: taking what belongs to another is theft, even when a father prefers one wife over another. Adam Clarke and Matthew Henry explain that "hated" means loved less, a common biblical idiom (compare Genesis 29:31). Barnes notes that Moses did not create the right of primogeniture but regulated an existing custom. Keil and Delitzsch emphasize the father must "acknowledge" (יַכִּיר, yakir) the actual firstborn, recognizing him as such, not merely naming him. The law does not approve polygamy; it limits its damage, as Wesley observes. The double portion, פִּי שְׁנַיִם (pi shenayim), literally "a mouth of two", belongs to the firstborn by right, not paternal whim.
How settled is the interpretation?
Interpretive difficulty: Medium
Main views:
- Traditional polygamy context: The plain reading of the passage assumes two wives simultaneously, consistent with the patriarchs' practice. Commentators like Calvin, Keil and Delitzsch, and Matthew Henry adopt this view.
- Successive marriages: Jamieson-Fausset-Brown argue that the verbs in the past tense indicate the first wife is dead, so the law addresses a man who married twice in sequence. They note the phrase 'hers that was hated' implies she is no longer alive.
What is clear: The firstborn son, regardless of his mother's status in the father's affections, is entitled to the double portion of the inheritance, and the father cannot transfer that right out of personal preference.
What Scholars Agree and Debate
| Topic | Agreed | Debated |
|---|---|---|
| Polygamy and the law | Christians agree that the law does not endorse polygamy but regulates an existing practice to protect the vulnerable. | Some commentators (e.g., Jamieson-Fausset-Brown) argue the law addresses successive marriages after a wife's death, not concurrent polygamy. Others (most commentators) see it as addressing the common practice of polygamy in ancient Israel. |
| Meaning of "hated" | Most agree it means loved less, a comparative term (Clarke, Wesley). | A minority reads it as literal hatred, but the context supports the comparative sense. |
| Paternal authority and disinheritance | The law forbids arbitrary transfer of birthright based on favoritism. | Calvin and others hold that a father may disinherit for just cause (e.g., Reuben's sin), while some traditions emphasize the inviolability of the birthright. |
| Contemporary application | The principle of protecting the vulnerable from partiality applies today. | Some apply it directly to inheritance law; others focus on the broader call to fairness in family relationships. |
Historical & Cultural Context
This law sits within a section of Deuteronomy 21 that addresses family power dynamics. Verses 10-14 protect a captive woman taken as a wife; verses 18-21 deal with a rebellious son. Here, the law guards the firstborn son in a household with two wives. Polygamy was practiced in ancient Israel, Abraham, Jacob, David, and others had multiple wives, but it was never God's original design (Matthew 19:8). The law does not endorse it; it steps into a broken situation to bring justice.
In the ancient Near East, the firstborn son held a privileged position. He received a double portion of the inheritance (פִּי שְׁנַיִם) and assumed family leadership. The phrase "beginning of his strength" (רֵאשִׁית אֹנוֹ) also appears in Genesis 49:3, describing Reuben as the firstfruits of Jacob's vigor. This phrase underlines the firstborn as the first expression of his father's generative power, a mark of honor. The right of primogeniture was not created by Moses but was customary; the law here protects it from arbitrary change. As the Cambridge Bible notes, this law "vetoes what was at least the occasional practice" of favoring a younger son from a favored wife. The father's authority is real but bounded: he cannot out of mere partiality transfer the birthright. The story of Jacob and his wives Leah and Rachel illustrates the situation (Genesis 29:30-31). Jacob loved Rachel more than Leah, and although Leah bore his firstborn, Reuben, the birthright was later transferred to Joseph, but only because of Reuben's sin (1 Chronicles 5:2). The law prevents a father from doing what Jacob did not do: transferring the birthright without just cause.
Textual Notes
The consulted sources note no significant textual variants for Deuteronomy 21:15-17. The Masoretic Text is consistent across manuscripts, and the ancient versions (Septuagint, Vulgate) agree in substance.
Reception History
In Jewish tradition, this law confirmed the inviolability of the firstborn's portion, as seen in the Mishnah and Talmud. Early church fathers like Augustine referenced it in discussions of justice and order in the household. During the Reformation, Calvin and Luther used it to emphasize the limits of human authority and the need for God's law to curb sin. In more recent centuries, it has been cited in debates about inheritance and family ethics, often as an example of God's care for the overlooked.
Preaching This Verse
Three-point outline
- God's Justice in Imperfect Families: The law confronts polygamy and favoritism head-on. It does not approve these practices but brings order. Grace meets us where we are, and God protects the vulnerable even within broken systems.
- The Firstborn's Right Is God-Given: The double portion is not the father's gift; it belongs to the firstborn. The father must acknowledge (יַכִּיר) him, recognize what is true. Some rights are not ours to give or take.
- Paternal Authority Has Limits: The father's power is real but not absolute. He cannot act on mere preference. Where human authority oversteps God's order, God's law steps in to correct it.
Five-point outline
- The situation: a man has two wives, one loved and one loved less.
- The firstborn son belongs to the less-loved wife.
- The father is tempted to favor the son of the beloved wife.
- The law prohibits this: he may not transfer the birthright.
- He must acknowledge the true firstborn and give him the double portion.
Illustration hooks
- Blended family tensions: A parent favoring children from a preferred relationship over the eldest from a previous marriage. This law would prevent that injustice.
- Workplace favoritism: A boss promoting a personally preferred but less qualified employee over a more deserving one. The principle of justice applies beyond family.
- Everyday partiality: In families, we may unconsciously favor a child who is easier or more like us. This law calls us to fairness and to see each person's God-given place.
Questions your congregation is asking
- What if the firstborn is unworthy? Does this law forbid disinheritance for cause? (Other passages show that just cause, like Reuben's sin, can change the birthright.)
- How does this apply if there is no large inheritance? The principle of fairness transcends wealth; it applies to how we honor and treat our children.
- Does this law mean God approves of polygamy? No, it regulates a practice he tolerated, never endorsed, pointing to his original design of one man and one woman.
Leading a Discussion
This law reveals God's heart: even in messy family situations, he insists on justice. The firstborn son of the less-loved wife is not to be overlooked. This discussion guide invites your group to consider how God's order protects the vulnerable and challenges our natural inclinations to favor those we prefer.
Discussion questions
- Read Deuteronomy 21:15-17 aloud. What stands out to you about the situation described?
- The law uses the words "beloved" and "hated." Based on the context and commentators, what do these words actually mean? (See Genesis 29:31, which says of Leah:
)"Yahweh saw that Leah was hated, and he opened her womb, but Rachel was barren."
— Genesis 29:31 (WEB) - Why do you think the father might be tempted to favor the son of the beloved wife? What emotions or pressures might drive that?
- How does the phrase "the beginning of his strength" (v.17) shape your understanding of the firstborn's role and value?
- What does this law reveal about God's view of justice in family life, even when human choices create messy situations?
- In what areas of your own life are you tempted to show partiality? How can this passage speak to that?
- How does this law point forward to the New Testament teaching that God shows no partiality (Acts 10:34, Romans 2:11)?
Word Study
The key original-language words in this verse. Select any word for its full lexicon entry — meaning, every occurrence in Scripture, and related words.
Cross-References
Source: Treasury of Scripture Knowledge (TSK, public domain)
| Genesis 29:18 | Jacob loved Rachel. He said, “I will serve you seven years for Rachel, your younger daughter.” |
| Genesis 29:20 | Jacob served seven years for Rachel. They seemed to him but a few days, for the love he had for her. |
| Genesis 29:30 | He went in also to Rachel, and he loved also Rachel more than Leah, and served with him seven more years. |
| Genesis 29:31 | Yahweh saw that Leah was hated, and he opened her womb, but Rachel was barren. |
| Genesis 29:33 | She conceived again, and bore a son, and said, “Because Yahweh has heard that I am hated, he has therefore given me this son also.” She named him Simeon. |
| I Samuel 1:4 | When the day came that Elkanah sacrificed, he gave portions to Peninnah his wife and to all her sons and her daughters; |
| I Samuel 1:5 | but he gave a double portion to Hannah, for he loved Hannah, but Yahweh had shut up her womb. |
| I Chronicles 5:2 | For Judah prevailed above his brothers, and from him came the prince; but the birthright was Joseph’s)— |
Interlinear and lexical data from STEPBible (CC BY 4.0). Cross-reference data from OpenBible.info (CC BY 4.0). Commentaries are public domain.
For personal reflection
Read the devotional page — prayer, application, and "for families"
What the Commentators Say
11 public-domain commentaries, condensed into plain language.
Adam Clarke's Commentary Methodist/Wesleyan 1826
Clarke explains that the word "hate" in Scripture does not mean active hatred but simply loving someone less than another. He also observes that polygamy existed under Moses but was only tolerated, not commanded, because of human hardheartedness.
Barnes' Notes on the Bible Protestant 1832
Barnes observes that Moses did not invent the rights of the firstborn but found them already established in Eastern society. What Moses did was regulate them: a father could still set aside those rights for genuine cause, but not out of simple favoritism.
Calvin's Commentaries Reformed 1564
Calvin sees this law as an extension of the Eighth Commandment, protecting the firstborn's inheritance from a father's natural favoritism toward a second wife. He warns that to reject the son God has honored is to arrogate divine authority, as if the father could create a new heir by his own will.
Cambridge Bible for Schools and Colleges Anglican 1880
This commentary notes that the law forbids a father from giving the firstborn's double portion to a son from a favorite wife, vetoing a practice that occurred in early Israel. The commentator suggests the law was adopted by Deuteronomy from an earlier source, as it lacks the book's usual phrasing and only covers this specific case.
Geneva Bible Notes Reformed 1599
The Geneva note stresses that a father's personal feelings toward his wives do not override the legal right of the firstborn son. Even if the firstborn is from the unloved wife, the father must still give him the double portion of the inheritance. The birthright is a fixed right tied to being the firstborn, not something the father can reassign based on affection.
Gill's Exposition of the Bible Baptist 1748
Gill stresses that this law regulates a situation God permitted but never approved. A man may not transfer the firstborn's double portion to the son of a more beloved wife; the birthright belongs irrevocably to the actual firstborn, regardless of personal favoritism.
Jamieson-Fausset-Brown Commentary Protestant 1871
JFB insists the passage does not address polygamy at all. The past-tense verbs and the phrase "hers that was hated" show the first wife is dead, so the case concerns a man who remarried after being widowed. The law protects inheritance rights of the first wife's son against the living second wife's influence.
Keil & Delitzsch OT Commentary Protestant 1876
Keil-Delitzsch emphasizes that Moses did not invent the right of the firstborn but simply protected this long-standing custom from being overridden by a father's favoritism. The law required the father to give the true firstborn, even from a hated wife, a double portion of the inheritance.Keil-Delitzsch emphasizes that Moses did not create the right of the firstborn but protected an existing custom from being overturned by a father's personal favoritism. The law required treating the actual firstborn son, even from an unloved wife, as such and giving him a double portion of the inheritance.
Lange's Commentary Reformed 1857
Lange sees these laws as Moses applying the seventh commandment by regulating natural but harsh wartime customs with humanity. The month-long delay for a captive woman and the protection of a firstborn’s inheritance show that one act of violence should not lead to another. This humane restraint prepares the way for divine truth.
Matthew Henry's Commentary Reformed/Presbyterian 1710
Henry treats this law as a practical warning against the misery of having more than one wife, noting that favoritism inevitably breeds conflict and grief. He also observes that Providence often gives the firstborn son to the less-loved wife, as with Leah, showing God's pattern of honoring the overlooked.
Wesley's Explanatory Notes Methodist/Wesleyan 1754
Wesley distinguishes toleration from approval: allowing two wives is not the same as making it lawful. He explains that the passage only provides for children in such cases. When it says a wife is hated, Wesley clarifies this means she is loved less, not actively despised.