John Gills Exposition of the Bible Commentary - Genesis 9:15
And I will remember my covenant which is between me and you, and every living creature of all flesh ,.... See Genesis 9:11 . and the waters shall no more become a flood to destroy all flesh ; this is repeated to remove those fears which would naturally arise, upon the gathering of the clouds in the heavens; but as God would remember his covenant, which he can never forget; and is always mindful of, so men, when they see the bow in the cloud, may be assured, that whatever waters are in... read more
Matthew Henry's Complete Commentary - Genesis 9:12-17
Articles of agreement among men are usually sealed, that the covenants may be the more solemn, and the performances of the covenants the more sure, to mutual satisfaction. God therefore, being willing more abundantly to show to the heirs of promise the immutability of his councils, has confirmed his covenant by a seal (Heb. 6:17), which makes the foundations we build on stand sure, 2 Tim. 2:19. The seal of this covenant of nature was natural enough; it was the rainbow, which, it is likely, was... read more