Genesis 9:8 Then God said to Noah and to his sons with him, 9 “Behold, I establish my covenant with you and your offspring after you, 10 and with every living creature that is with you, the birds, the livestock, and every beast of the earth with you, as many as came out of the ark; it is for every beast of the earth. 11 I establish my covenant with you, that never again shall all flesh be cut off by the waters of the flood, and never again shall there be a flood to destroy the earth.” 12 And God said, “This is the sign of the covenant that I make between me and you and every living creature that is with you, for all future generations: 13 I have set my bow in the cloud, and it shall be a sign of the covenant between me and the earth.
There are only a handful of covenants made by God in Scripture. This is the first of them. At the beginning of this chapter, God told Noah and his sons to go out and fill the earth. That did not mean they were on their own; God would maintain a relationship with them. They would not have to live in fear of such a great flood of judgment again. In the proceeding verses, He also promised that human life would be sacred, unlike the time before the flood when wicked men were given to violence. Along with His promise to watch over them was a new standard they were to live by before Him, being good stewards of the renewed creation He was entrusting to them. The rainbow reminds us of God's faithfulness.