Psalms 148:7 - Joseph Benson’s Commentary on the Old and New Testaments

Praise the Lord from the earth, ye dragons, and all deeps “From heaven above the psalmist descends to the deep beneath, which, while it proclaims the power, observes the laws and decrees of him who made it, and poured it abroad. And the same may be said of its enormous inhabitants, which are under the command of Jehovah, and of none but him.” By dragons here, we may either understand serpents, which abide in the deep caverns or holes of the earth; or, rather, whales, crocodiles, and other sea monsters, which dwell in the depths of the sea, or of rivers, and are often intended by the word תנינים, here rendered dragons.