Matthew Poole and continuators on Job 41:31

31. He maketh the deep to boil like a pot : he maketh the sea like a pot of ointment .

The deep Waters, or the Sea, which is called the deep, Psal. 107. 24 Ionah 2. 3 as it is explained in the next Clause.

To swell, and foam, and froth by his strong and vehement motion, as any Liquor doth when it is boiled in a pot.

Either the great Sea, the proper place of the Whale, Psal. 104. 25. or the great River Nilus, which is called a Sea, both in Scripture, as Isa. 11. 15. and in other Authors (of which see my Latin Synopsis) as Euphrates is called the Sea of Babylon, Isa. 21. 1. Jer. 51. 36. or Lakes or Pools, which are most frequently called Seas both in the Old and New Testament, as every one knows. And in such Lakes the Crocodiles are no less than in Nilus, as it is attested by Herodotus, and Strabo, and others.

This Clause seems to be added very emphatically to intimate that this Leviathan causeth not onely a vehement commotion, but also a great fragrancy in the Sea or Waters where it is. Which, though it was not observed by the Ancients, yet is unanimously affirmed by later Authors upon their own knowledge and experience, that it [illegible: 1+ letters]asts a perfume like Musk; of which see the Names and Words of the Authors in my Latin Synopsis.