In Genesis, a rainbow was the sign of God’s covenant with Noah and the flood survivors. Genesis 9:12–17 presents the rainbow as a reminder of the promise that a flood would not again destroy all flesh on earth.
The covenant follows Noah’s departure from the ark and his offering. It is described as involving God, Noah, his descendants, and every living creature. The rainbow therefore functions in the narrative as a sign with universal scope rather than merely a private symbol for Noah’s family.
Genesis does not say that rainbows first appeared at this moment. Instead, it gives the rainbow a covenant meaning within the story. The passage connects the sign with clouds and rain, making it a visible reminder of the promise whenever it appears. Later traditions frequently treat the rainbow as a general symbol of hope, peace, and divine faithfulness.