20 And God saith, 'Let the waters teem with the teeming living creature, and fowl let fly on the earth on the face of the expanse of the heavens.' 21 And God prepareth the great monsters, and every living creature that is creeping, which the waters have teemed with, after their kind, and every fowl with wing, after its kind, and God seeth that 'it is' good. 22 And God blesseth them, saying, 'Be fruitful, and multiply, and fill the waters in the seas, and the fowl let multiply in the earth:' 23 and there is an evening, and there is a morning—day fifth.
Matthew Henry's Commentary on Genesis 1:20-23
Commentary on Genesis 1:20-25
(Read Genesis 1:20-25)
God commanded the fish and fowl to be produced. This command he himself executed. Insects, which are more numerous than the birds and beasts, and as curious, seem to have been part of this day's work. The Creator's wisdom and power are to be admired as much in an ant as in an elephant. The power of God's providence preserves all things, and fruitfulness is the effect of his blessing.