Deuteronomy 27:20 Commentary: Curse on Dishonoring Father's Wife

Deuteronomy 27 describes a ceremony that took place after Israel crossed the Jordan into Canaan. Moses commanded that six tribes stand on Mount Gerizim to bless and six on Mount Ebal to curse, while the Levites recited a series of twelve curses in a loud voice. After each curse, all the people responded 'Amen', a public, binding acceptance of the covenant terms. This ritual reenacted the blessings and curses first announced at Sinai (Deuteronomy 11:26, 29).

The euphemism 'uncover his father’s skirt' (Hebrew kanaph, literally 'wing' or 'corner of a garment') was a common ancient Near Eastern idiom for sexual intercourse that violated a father’s conjugal rights. Leviticus 18:8 and 20:11 explicitly forbid lying with a father’s wife, calling it 'uncovering your father’s nakedness.' The phrase 'father’s wife' (literally 'the wife of his father') typically refers to a stepmother, not necessarily the man’s biological mother, though Leviticus 18:7 already prohibits relations with one’s mother. This law protected the father’s marriage even after his death, since the curse applies without time limit.

The most famous biblical example is Reuben, Jacob’s firstborn, who lay with Bilhah, his father’s concubine (Genesis 35:22). For this act, Reuben lost his birthright (Genesis 49:4; 1 Chronicles 5:1). Later, Absalom publicly slept with David’s concubines as a political act of usurpation (2 Samuel 16:22). Ezekiel 22:10 condemns Judah for the same sin. Thus the curse guards not only sexual morality but the father’s authority and the stability of the household, a cornerstone of Israelite society. The public 'Amen' from all the tribes, including Reuben’s, forced every Israelite to own the standard, not just hear it.

The consulted sources note no significant textual variants for Deuteronomy 27:20. The Hebrew text is stable across manuscripts, and the verse appears uniformly in the Masoretic tradition. The few minor variations in spelling (e.g., the Ketiv/Qere of 'father’s wife' and the form of 'amen') do not affect interpretation.

This verse has been read within both Jewish and Christian traditions as a solemn warning against sexual sin that dishonors family bonds. The Talmud and midrashim connect the curse to Reuben’s sin and discuss the implications for inheritance and family order. Early Christian commentators, drawing on the Septuagint, saw the curse as reinforcing natural law and the sanctity of marriage. In the Reformation era, Matthew Henry and Calvin emphasized the public nature of the curse as a deterrent to hidden sins and as a call for communal integrity. The phrase 'uncover his father’s skirt' was consistently understood as a euphemism, and the 'Amen' response became a model for congregational affirmation of God’s judgments.

Three-point outline

1. The public curse in covenant context, This is not a private warning but a loud, communal proclamation on Mount Ebal. The community binds itself to God’s justice by saying 'Amen.' Sins hidden from human courts are exposed before God and the congregation.
2. The specific sin: dishonoring a father’s bed, Lying with a father’s wife violates the marriage covenant and the father’s honor. The euphemism 'uncover his father’s skirt' emphasizes that this is not merely a physical act but a breach of trust and authority.
3. The corporate 'Amen', Every tribe, including Reuben’s descendants, had to agree with the curse. This shows that no one is exempt from the law’s demands, and the community takes responsibility for upholding God’s standards.

Five-point outline

1. The ceremony: twelve curses pronounced by Levites from Mount Ebal, with the congregation affirming each one.
2. The sin: sexual relations with a father’s wife (stepmother or, in some interpretations, the man’s own mother, though covered separately in Leviticus).
3. The euphemism: 'uncover his father’s skirt', a Hebrew idiom for violating the father’s marital rights and family honor.
4. The biblical precedent: Reuben’s sin cost him his birthright; Absalom used the same act to claim the throne.
5. The community’s response: 'Amen' means 'truly' or 'so be it', a binding agreement that God’s judgment is right.

Illustration hooks

• A community covenant: Imagine a small town gathering in the town square to publicly affirm that certain wrongs, like domestic abuse or financial fraud, will not be tolerated. Everyone says 'Amen,' holding each other accountable.
• Family honor in the ancient world: In many cultures today, the phrase 'family name' still carries weight. A public curse against anyone who shames the family reflects how seriously God treats the bonds He created.
• The silence of Reuben: When this curse was read, the tribe of Reuben had to say 'Amen' alongside everyone else. They couldn't hide their ancestor’s sin, they had to agree that it was wrong.

Questions your congregation is asking

• Why does God single out this sin for a public curse when other sexual sins are also prohibited?
• What does 'uncover his father’s skirt' mean, and why is that phrase used instead of a direct term?
• How does this Old Testament curse apply to Christians today, do we still have covenantal curses?

This verse is part of a covenant-renewal ceremony where Israel publicly accepted the consequences of breaking God’s law. The curse against lying with a father’s wife shows that God cares about the hidden sins of the family as much as public crimes. The community’s 'Amen' makes every person responsible for upholding justice, not just the leaders.

Discussion questions

1. What strikes you about the setting of this curse, the loud voice of the Levites, the two mountains, the response of the people?
2. The euphemism 'uncover his father’s skirt' appears in several Old Testament passages (Deuteronomy 22:30, Leviticus 18:8). Why do you think the Bible uses such language for sexual sin?
3. Read Genesis 35:22 and 49:4. How does Reuben’s story illustrate the gravity of this curse? What were the long-term consequences?
4. This curse covers a sin that might be committed in secret. Why does God make it part of a public ceremony? What does this say about hidden sins?
5. The entire community said 'Amen', including the tribe of Reuben. How does corporate confession and accountability function in your church community today?
6. How does this passage challenge the way we think about sexual morality and family honor in modern culture?
7. If this curse was part of Israel’s covenant, how does the New Testament teach Christians to address serious sin in the church (see Matthew 18:15, 17; 1 Corinthians 5:1, 5)?