Job 40:18 · Bible study
Job 40:18 Commentary: The Meaning of Behemoth's Unbreakable Frame
Hebrew · 10 what the commentators say
Meaning in one sentence
Why does God describe Behemoth's bones as bronze tubes and iron bars? A look at this verse's place in Job's lesson on divine power and human limitation.
Research Summary
- Meaning: Behemoth’s bone structure, described with the strongest known metals, underscores God’s sovereign power over creation and human limitation.
- Key words: aphik (tubes/channels), nechushah (bronze/copper), barzel (iron), all denote strength, durability, and the Creator’s superior craftsmanship.
- Main debate: Whether Behemoth is a literal animal (hippopotamus, elephant) or a mythological beast; the theology of God’s power is not affected by the decision.
- Theological theme: God’s wisdom and power in creation exceed human comprehension; humanity must adopt humility before the Creator.
- Best use: Context for sermons on suffering, divine sovereignty, and worship that begins with awe.
Translation Comparison
BSB Berean Standard Bible 2020
His bones are tubes of bronze; his limbs are rods of iron.
WEB World English Bible 2000
His bones are like tubes of bronze. His limbs are like bars of iron.
KJV King James Version 1769
His bones are as strong pieces of brass; his bones are like bars of iron.
ASV American Standard Version 1901
His bones areastubes of brass; His limbs are like bars of iron.
YLT Young's Literal Translation 1898
His bones are tubes of brass, His bones are as a bar of iron.
Darby Darby Bible 1890
His bones are tubes of bronze, his members are like bars of iron.
Douay-Rheims Douay-Rheims Bible 1899
Behold, he will drink up a river, and not wonder: and he trusteth that the Jordan may run into his mouth.
Translations in other languages (10 available)
He aquí que él tomará el río sin inmutarse: y confíase que el Jordán pasará por su boca.
Seus ossos são como tubos de bronze; seus membros, como barras de ferro.
Que le fleuve vienne à déborder, il ne s’enfuit pas:
Seine Knochen sind wie eherne Röhren; seine Gebeine sind wie eiserne Stäbe.
Zijn beenderen zijn als vast koper; zijn gebeenten zijn als ijzeren handbomen.
Le sue ossa sono tubi di rame; le sue membra, sbarre di ferro.
Oto zatrzymuje strumień, że się nie spieszy; tuszy sobie, iż Jordan wypije gębą swoją.
вот, он пьет из реки и не торопится; остается спокоен, хотя бы Иордан устремился ко рту его.
牠的骨頭 好像銅 管；牠的肢體 彷彿鐵 棍。
His bones are pipes of brass, his legs are like rods of iron.
Verse in Context
Original Language (Biblical Hebrew)
Old Testament · Biblical Hebrew · Job 40:18
Source: STEPBible TAGNT/TEHB (CC-BY 4.0). Click or tap a morphology code to see the full parsing.
Scholars' Consensus
Commentators broadly agree that this verse uses hyperbole to stress Behemoth’s extraordinary strength, pointing back to God’s unmatched power. Barnes notes that the Hebrew word translated “strong pieces” (aphik) can also mean “tubes” or “channels”; he follows some scholars who see it as “hollow tubes of brass,” but argues the more common meaning “strong, mighty” also fits, so the bones seemed like solid metal. Gill emphasizes that nothing is stronger than brass and iron, and that this description applies not only to the creature’s teeth but to its entire skeleton. Keil and Delitzsch render them “tubes of brass” and relate the metaphor to the hippopotamus’s remarkably dense bone structure for an aquatic animal. The consensus is clear: the poetic imagery of bronze and iron conveys invulnerability. The verse sets up God’s final question to Job: if you cannot control this beast, how can you stand before its Maker?
How settled is the interpretation?
Interpretive difficulty: Medium
Main views:
- Literal animal (hippopotamus or elephant): Ancient Egyptian and Hebrew names (water-ox), physical details like eating grass and resting in water, consistency with other ancient descriptions.
- Mythological chaos beast: The parallel with Leviathan (a dragon-like creature in Job 41 and elsewhere), the hyperbolic language, and the theme of God subduing chaos.
What is clear: God’s power over creation is greater than human power; the imagery of metal-strength bones is meant to humble and awe the reader.
What Scholars Agree and Debate
| Topic | Agreed | Debated |
|---|---|---|
| Identity of Behemoth | Christians agree that the passage describes a real or symbolically real creature of immense strength, created by God. | Some identify it as a hippopotamus or elephant based on ancient Near Eastern parallels; others see a mythological chaos dragon representing evil. Both sides appeal to the wider context of God's speech and ancient literature. |
| Interpretation of 'tubes' (aphik) | The word implies something hollow but strong, whether literal bone structure or a poetic comparison. | Barnes notes that some translate it as 'strong pieces' (solid metal); others, following Gesenius, prefer 'tubes' (hollow channels). The metaphor works either way: the bones are exceptionally tough. |
| Theological purpose of the imagery | The description aims to humble Job by showing a creature he cannot subdue, thereby pointing to God's supreme power. | Some traditions focus on creation as a display of God's glory; others emphasize the contrast between human frailty and divine strength. No major tradition denies the core point. |
Historical & Cultural Context
Job 40:18 belongs to God’s speech from the whirlwind (chapters 38, 41), a sustained display of divine wisdom and power. After Job has demanded an audience with God, the Lord answers not with explanations of suffering but with a tour of creation. Behemoth, introduced in verse 15, is described in graphic physical detail. Most ancient interpreters identified Behemoth as the hippopotamus, though some suggested the elephant. Keil and Delitzsch derive the name from Egyptian p-ehe-mau, “water-ox,” confirming the setting in the Nile region. Bronze (more accurately copper) and iron were the hardest materials known in the ancient Near East, used for weapons, tools, and structural supports. By comparing Behemoth’s bones to “tubes of bronze” and “bars of iron,” the poet taps into everyday knowledge of metal’s strength. The word “tubes” (aphik) normally means a river channel or ravine, a hollow bed. The paradox of hollow bones that are as strong as metal would be striking: aquatic animals often have lighter, more porous bones, but this creature is built like a siege engine. Cross-references reinforce the motif: Isaiah 48:4 uses “iron sinew” and “bronze brow” to describe human obstinacy; here the same terms exalt the beast’s raw power. The purpose is not zoological precision but theological punch. Job has claimed he could argue his case before God (Job 13:3, 23:4). God responds by painting a creature that Job cannot control, hunt, or even safely approach. The description of Behemoth’s bones is part of a crescendo: if the bones of one beast are beyond human handling, who can stand against the God who made it?
Textual Notes
None of the supplied commentary sources mention significant textual variants for Job 40:18. The Hebrew manuscripts are stable; the main variations across English translations stem from lexical choices for aphik (tubes vs. strong pieces) rather than manuscript differences. The consulted sources note no variant readings that affect the meaning.
Reception History
Early Christian writers such as Origen and Gregory of Nyssa often read Behemoth allegorically, as a type of Satan or a demonic power that only Christ can overcome. This interpretive tradition emphasized the spiritual battle and the ultimate victory of God. Medieval and Reformation commentators, including Aquinas, Calvin, and Matthew Henry, generally returned to a literal reading, identifying Behemoth with the hippopotamus or the elephant. They focused on how the description magnifies the Creator. In modern scholarship, the debate over the exact animal continues, but the consensus remains that the passage serves the book’s larger theodicy: God’s ways are beyond human understanding, and true wisdom begins with reverence.
Preaching This Verse
Three-point outline
- God’s power in creation. Bronze and iron represent the strongest materials of the ancient world. By using them to describe a single creature, God shows that His creative power far exceeds anything humans can manufacture or control.
- Human limitation. Job cannot argue down a hippopotamus. The sheer physical force of Behemoth reminds us that humanity is not the measure of all things. We are creatures among creatures.
- Trust in the Creator. The same God who made the unbreakable Behemoth also made you. He wields power that surpasses our understanding, and He invites us to trust His wisdom even when we cannot see the whole picture.
Five-point outline
- The creature’s bones. Not just any bones, but the internal frame, the hidden source of strength. God knows the deepest structures of both beasts and human hearts.
- The materials chosen. Bronze (copper) and iron were shaped by fire, hammer, and anvil. They imply a Creator who forms and strengthens His works through process and pressure.
- The contrast with Job’s frailty. Throughout the book, Job’s body is weakened, his bones ache (Job 30:17). Behemoth’s unbreakable bones highlight human fragility.
- God’s care for the powerful. Even this dangerous beast eats grass (v.15) and rests under lotus trees (vv.21, 22). God provides for all His creatures, strong and weak alike.
- Worship that acknowledges size. Many of us prefer a God we can manage. Behemoth shatters that illusion and invites us to worship a God who is truly great.
Illustration hooks
- A construction crane. When we see a machine that can lift tons, we respect the engineer who designed it. Behemoth is a living crane, and its designer is God.
- Weightlifting. We train for months to lift a few hundred pounds. God’s creatures carry their own skeletons without effort. The comparison humbles our pride in human strength.
- A steel beam. The frame of a skyscraper is hidden inside the finished building. Behemoth’s bones are like those beams, invisible but essential. God sees the structure that holds everything together.
Questions your congregation is asking
- Why does God spend so much time describing animals when Job is suffering?
- Does describing Behemoth’s strength make God seem dangerous rather than loving?
- How can someone in pain find comfort in God’s power over wild beasts?
Leading a Discussion
God’s speech to Job is one of the most dramatic moments in Scripture. After thirty-seven chapters of human debate, the Lord speaks from a whirlwind and does not answer Job’s questions directly. Instead, He takes Job on a tour of creation, stars, storms, lions, and finally Behemoth. These verses ask us to see the world from God’s perspective, not our own. As you discuss this passage, notice how physical detail points to a larger truth about power, trust, and humility.
Discussion questions
- Read Job 40:15, 18. What words or images stand out to you? Which ones surprise you?
- Why do you think God chooses to describe a creature that most people never see? What does that choice say about His priorities?
- The Hebrew word for “tubes” (aphik) can also mean “ravine” or “channel.” How does the idea of a hollow but strong bone shape your understanding of the verse?
- Bronze and iron are both metals that come from ore refined by fire. What does this metaphor suggest about strength that is forged through difficulty?
- Compare this passage with Job 38:4, 7, where God asks Job where he was when the earth’s foundations were laid. How does the description of Behemoth continue that theme?
- Some Christians read Behemoth as a literal hippopotamus, others as a mythological symbol of chaos. How does each reading affect the message of the passage? Can both be true?
- In what areas of life do you most feel your own weakness compared to God’s strength? How does this verse invite you to trust rather than to fear?
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)
| Job 7:12 | Am I a sea, or a sea monster, that you put a guard over me? |
| Isaiah 48:4 | Because I knew that you are obstinate, and your neck is an iron sinew, and your brow bronze; |
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
10 public-domain commentaries, condensed into plain language.
Adam Clarke's Commentary Methodist/Wesleyan 1826
Clarke notes that the creature’s bones are as strong as brass bars or iron. He says this tusk is unusually hard solid and heavy for its size.
Barnes' Notes on the Bible Protestant 1832
Barnes clarifies that the metal called "brass" in older translations is actually copper, since brass was not yet known in Job's time. He also notes that while some scholars interpret the Hebrew word for "strong pieces" as "tubes," he reads it as "strong" or "mighty," so the bones appear solid and firm like cast metal.
Cambridge Bible for Schools and Colleges Anglican 1880
Cambridge Bible for Schools and Colleges notes that the creature described here has very strong muscles and bones. These parts are made of hard metal so they are extremely durable.
Geneva Bible Notes Reformed 1599
The Geneva Note highlights the behemoth’s calm, unhurried power as it drinks an entire river. This beast does not strain or rush; it trusts its own strength to draw up the Jordan, showing a creature so vast that even a mighty river is like a drink to it.
Gill's Exposition of the Bible Baptist 1748
Gill argues that the description of bones like brass and iron cannot fit an elephant, whose bones are mostly porous and spongy, only its teeth are hard. This contrast, he suggests, points to a different creature whose overall skeletal strength matches the text's vivid image.
Jamieson-Fausset-Brown Commentary Protestant 1871
strong —rather, "tubes" of copper [UMBREIT].
Keil & Delitzsch OT Commentary Protestant 1876
Keil-Delitzsch identify behemoth specifically as the hippopotamus, arguing its Hebrew name derives from the Egyptian phrase meaning water-ox. They develop the physical description through detailed word studies, comparing the tail to a cedar branch and the sinews to intertwined vine branches, all to emphasize the creature's immense strength as the giant among beasts.
Lange's Commentary Reformed 1857
Lange reads the description of
Matthew Henry's Commentary Reformed/Presbyterian 1710
Henry sees behemoth as a picture of God’s power to create things far greater than humans. He believes this creature shows that only God can bring his sword close to it.
Wesley's Explanatory Notes Methodist/Wesleyan 1754
Wesley notes that not every eagle species feeds on carcasses, but many do. He then emphasizes the eagle's remarkable speed, flying to the prey in an instant with astonishing swiftness.