Promise

God said, "I set My bow in the cloud, and it shall be for a sign of a covenant between Me and the earth. It shall come about, when I bring a cloud over the earth, that the bow will be seen in the cloud, and I will remember My covenant, which is between Me and you... when the bow is in the cloud, then I will look upon it, to remember the covenant between God and every living creature of all flesh that is on the earth."

Genesis 9:12-14, 16