Clarke's Bible Commentary - Job 40:17
Verse 17. He moveth his tail like a cedar ] Therefore it was neither the elephant, who has a tail like that of the hog, nor the hippopotamus, whose tail is only about a foot long. The sinews of his stones ] I translate with Mr. Good, and for the same reasons, the sinews of his haunches, which is still more characteristic; as the animal must have excelled in leaping.
Matthew Henry Commentary
Verses 15-24 - God, for the further proving of his own power, describes two vas animals, far exceeding man in bulk and strength. Behemoth signifie beasts. Most understand it of an animal well known in Egypt, called the river-horse, or hippopotamus. This vast animal is noticed as a argument to humble ourselves before the great God; for he created thi vast animal, which is so fearfully and wonderfully made. Whateve strength this or any other creature has, it is derived from God. He that made the soul of man, knows all the ways to it, and can make the sword of justice, his wrath, to approach and touch it. Every godly ma has spiritual weapons, the whole armour of God, to resist, yea, to overcome the tempter, that his never-dying soul may be safe, whateve becomes of his frail flesh and mortal body __________________________________________________________________
Original Hebrew
יחפץ 2654 זנבו 2180 כמו 3644 ארז 730 גידי 1517 פחדו 6344 ישׂרגו׃ 8276