John Gills Exposition of the Bible Commentary - Genesis 1:20
And God said, let the waters bring forth abundantly ,.... The waters gathered together in one place, the waters of the ocean, and those in rivers, pools and lakes, and which, before their collection into those places, had been sat on, moved, and impregnated by the Spirit of God; so that they could, as they did, by the divine order accompanied with his power, bring forth abundance of creatures, next mentioned: the moving creature that hath life : an animal life, of which sort of creatures... read more
Matthew Henry's Complete Commentary - 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. The work of creation not only proceeded gradually from one thing to another, but rose and advanced gradually from that which was less excellent to that which was more so, teaching us to press towards perfection and endeavour that our last works may be our best works. It... read more