After the Noah’s Ark flood, God gives a rainbow as the sign of the covenant.
Genesis 9:13 says God sets a rainbow in the clouds as the sign of the covenant with Noah and every living creature. The covenant promises that a flood will not again destroy all life on Earth. It is presented as a universal promise involving humans and animals, not only Noah’s family.
The rainbow therefore functions as a visible reminder within the story. It is not described as a new physical phenomenon created at that moment; rather, the narrative assigns it a covenantal meaning. The text also connects the sign with clouds and rain.
A common mix-up is treating the rainbow as the sign of the ark itself. In Genesis, the ark is the means of survival during the flood, while the rainbow appears afterward as the sign of a new promise.