Job 40:16
See the strength of his loins and the power in the muscles of his belly.
BSB
ASV
Lo now, his strength is in his loins, And his force is in the muscles of his belly.
KJV
Lo now, his strength is in his loins, and his force is in the navel of his belly.
What is understood by the loins except the delight of the flesh? Hence the Psalmist also asks, saying: "Burn my loins." For if he had not known that the pleasure of lust resides in the loins, he would by no means have asked that they be burned. Hence, because the power of the devil has prevailed over the human race especially through lust, it is said of him by the voice of the Lord: "His power is in his loins."
Lo now, his strength is in his loins,.... The strength of the elephant is well known, being able to carry a castle on its back, with a number of men therein; but what follows does not seem so well to agree with it; and his force is in the navel of his belly; since the belly of the elephant is very tender; by means of which the rhinoceros, its enemy, in its fight with it, has the advantage of it, by getting under its belly, and ripping it up with its horn (s).
On the other hand, Job 40:21, 22 are characteristic of the amphibious river horse. So leviathan (the twisting animal), Job 41:1, is a generalized term for cetacea, pythons, saurians of the neighboring seas and rivers, including the crocodile, which is the most prominent, and is often associated with the river horse by old writers.
Rare words are the text's own signal of a deliberate thread: the fewer the occurrences, the more the places it appears belong together.