He makes his tail stiff like a cedar; the sinews of his thighs are knit together.
Job 40:17 · ESVView all translations

God points Job to one animal and walks through its body piece by piece. Verse 17 is part of that list: the tail, and the tightly knit sinews of the thighs. This is not a lesson in zoology. If Job cannot match a single creature God made, how can he argue with the Creator?

Which Creature?

God calls this animal behemoth. Commentators differ over which creature that is, and verse 17 is the reason. Many say it is the hippopotamus. One writer argues from its diet that the name means river-ox, not river-horse:

"Behold now behemoth, which I made with you" — when I made you I made him. "He eats grass as an ox." I have, therefore, good reason for saying that it is a river-ox, and not at all a river-horse.

William Kelly

Others say the tail in this verse rules that out:

Some have thought this refers to a hippopotamus, but that animal has a small tail, while behemoth "makes his tail stiff like a cedar" (v.17). Perhaps this animal has now become extinct, for its tail seems to resemble that of a dinosaur.

Leslie M. Grant

An Anatomy of Power

The survey runs from loins to tail, and no part of this animal is weak:

Every portion of his anatomy speaks of strength — loins and body, legs and bones, and even tail, are alive with this power. So he is a chief of God's creatures, excelling in strength. His Creator gave him sharp, sword-like teeth, and with them he mows down the grass like an ox. He is harmless too when nothing stirs him up, since the other animals play beside him in the same pasture.

Samuel Ridout

That strength is never turned to anyone's benefit:

In other words, he is an untamable, uncontrollable beast. He is of no use for man's service. The entire description gives the impression of absolute power used for utterly selfish ends. It lives for itself, refusing to yield its strength to the service of others.

Samuel Ridout

The Measure of Job

The same hand made both the animal and the man:

How weak man is compared with this beast and its marvellous strength! Yet it is only a beast and Job is a man. How abominable then must Job's pride and boasting appear in the sight of the Lord.

Arno Clemens Gaebelein

The creature's strength is a gift from God, and the lesson reaches past bodily strength:

And yet he is only a creature. God gave him superhuman strength for His own all-wise purposes. Let Job, and everyone tempted to trust his own strength, look at this creature, self-sufficient and unstoppable. That strength may be strength of body, as here, or of heart and mind. How puny their own arm will look.

Samuel Ridout

Still Only a Creature

However great the beast, God knit the sinews of verse 17. The whole picture stays in His hand:

Note the striking words, "he is the first of the ways of God" (v.19). God created him as an object lesson for us of unstoppable strength. Only the God who made him can bring him down to nothing — a picture of putting him under the judgment of the sword.

Leslie M. Grant

A Picture of Pride

Commentators have long read a moral meaning in behemoth and in leviathan, the creature described next, and they offer it as likely rather than certain:

Both beasts stand for power and pride. So it does not seem entirely far-fetched to agree with another commentator, Wordsworth: "It seems probable that behemoth represents the Evil One at work in the animal and fleshly parts of man's own make-up, and that leviathan pictures the Evil One at work as the enemy outside him. Behemoth is the enemy inside us; leviathan is the enemy outside us."

Samuel Ridout

Read that way, Job would find the creature's likeness in his own heart:

To Job, behemoth would stand for that creature of pride which thrives among people who profess to belong to God. In the pride of his own self-righteousness, "proclaiming himself to be God," he would catch glimpses of this evil thing. One day it would grow into a full and hideous falling away from God. What more dreadful exposure of the evil of pride could he, or we, have? Self-righteousness, self-seeking, pride of conduct or of character, denies its need of Christ and of God. Such is sin in the flesh — incorrigible and hideous. Who can subdue it or change its nature?

Samuel Ridout

Who Holds the Reins

That question has an answer. No man can tame this beast, but it does not run free:

And yet behemoth is controlled, though not by man. God is over all... The Spirit will control the flesh, and while He lives in the Church He does not allow evil to develop fully. In a smaller way too, the Spirit controls and holds back the activity of the flesh. "Walk by the Spirit, and you will not gratify the desires of the flesh."

Samuel Ridout

Summary

- Made — God framed this beast, tail and sinew alike. Commentators differ on whether it is a hippopotamus or a creature now extinct, since a hippo's tail is nothing like a cedar.

- Massive — every part of the body is a study in strength, yet all of that power lives for itself and serves no one.

- Measured — set beside this creature, Job's arm looks tiny; so does anyone's strength of body, heart or mind.

- Mirrored — read as a picture, behemoth is the enemy inside us: self-righteousness and pride that denies its need of God.

- Mastered — what man cannot control, God controls. The Spirit holds the flesh in check, and only the God who made this beast can bring it down.

Reviewed by Orion on September 6, 2026