John Calvin Commentary Genesis 9:15

"and I will remember my covenant, which is between me and you and every living creature of all flesh; and the waters shall no more become a flood to destroy all flesh." — Genesis 9:15 (ASV)

And I will remember my covenant. Moses, by introducing God so often as the speaker, teaches us that the word holds the chief place, and that signs are to be assessed by it. God, however, speaks after the manner of men, when he says that at the sight of the rainbow he will remember his covenant. But this manner of speaking relates to human faith, so that they may reflect that God, whenever he stretches out his arch over the clouds, is not unmindful of his covenant.