He maketh the deep The deep waters; to boil like a pot To swell, and foam, and froth, by his strong and vehement motion, as any liquor does when it is boiled in a pot, especially boiling ointment. The sea Either the great sea, the proper place of the whale, Psalms 104:25, or the great river Nile, which is called a sea, both in Scripture, as Isaiah 11:15, and in other authors, as Euphrates is called the sea of Babylon, Isaiah 21:1; Jeremiah 51:36. Lakes also are most frequently called seas, both in the Old and New Testament; and in such lakes the crocodiles are, as well as in the Nile. He maketh a path to shine after him Houbigant renders the text, He leaves behind him a shining path; that is, the way in which he moves appears shining and conspicuous, as when a ship sails, and leaves a visible path behind it, which in the night appears to shine. One would think the deep to be hoary It is so covered with froth and foam that it looks as if it were grown old, and become hoary.
Related Commentaries of Job 41:31
Job 41:31-32
31 He maketh the deep to boil like a pot: he maketh the sea like a pot of ointment.
32 He maketh a path to shine after him; one would think the deep to be hoary.