Genesis 9:16

And the bow shall be in the cloud; and I will look upon it, that I may remember the everlasting covenant between God and every living creature of all flesh that is upon the earth. In speech which is modeled strongly after that of men, and by a repetition of thought which emphasizes the bow and the covenant of God and the relation between the two again and again, the Lord impresses the significance of His act upon Noah and his sons. Whenever dark clouds do arise for a rainstorm on the earth, and whenever this beautiful phenomenon of the rainbow appears, then God has given His promise to remember His eternal covenant not to destroy all living flesh with another flood.