Genesis 8:8-11

8Then Noah sent out1 a dove to see if the waters had receded from the surface of the ground. 9But the dove found no place to rest her foot, and she returned to him in the ark, because the waters were still covering the surface of all the earth. So he reached out his hand and brought her back inside the ark.

10Noah waited seven more days and again sent out the dove from the ark. 11And behold, the dove returned to him in the evening with a freshly plucked olive leaf in her beak. So Noah knew that the waters had receded from the earth.