Genesis 1:20 (BSB)

And God said, “Let the waters teem with living creatures, and let birds fly above the earth in the open expanse of the sky.”

From Genesis 1. Also in the ESV.

Commentary on Genesis 1:20

• John Calvin (Reformed), Calvin's Commentaries on Genesis 1:20: 20. Let the waters bring forth... the moving creature “Repere faciant aquae reptile animae viventis.” — “Let the waters cause to creep forth the reptile, (or creeping thing,) having a living soul.” This is a more literal translation of the original than that of the English version; yet it does not express more accurately the sense.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Genesis 1:20-23: Each day, hitherto, has produced very noble and excellent beings, which we can never sufficiently admire; but we do not read of the creation of any living creature till the fifth day, of which these verses give us an account.
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Genesis 1:20-23: FIFTH DAY. The signs of animal life appeared in the waters and in the air. (Gen 1:20-23) moving creature--all oviparous animals, both among the finny and the feathery tribes--remarkable for their rapid and prodigious increase. fowl--means every flying thing: The word rendered "whales," includes also sharks, crocodiles, &c.; so that from the countless shoals of small fish to the great sea monsters, from the tiny...
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Genesis 1:20: And God said, Let the waters bring forth abundantly the moving creature that hath life, and fowl [that] may fly above the earth in the open firmament of heaven. (p) As fish and worms which slide, swim or creep.