After the biblical Flood, God set a rainbow in the clouds as the sign of his covenant.
Genesis 9:12–17 describes the covenant between God, Noah, and every living creature. God promises that floodwaters will not again destroy all life on Earth, and the rainbow becomes the visible reminder of that promise. The text repeatedly connects the sign with the clouds and with the covenant.
The rainbow is therefore more than a weather detail in the story: it is a narrative symbol of remembrance and restraint. The covenant extends beyond Noah’s family to animals and future generations, making it one of the broadest covenants described in Genesis.
The biblical passage does not present the rainbow as a scientific explanation for atmospheric optics. It uses a familiar natural phenomenon as a covenant sign. In later Jewish, Christian, and wider cultural traditions, the rainbow has retained associations with hope, peace, and renewal.