Genesis 8:8-11

8Then he sent forth a dove from him, to see if the waters had subsided from the face of the ground. 9But the dove found no place to set her foot, and she returned to him to the ark, for the waters were still on the face of the whole earth. So he put out his hand and took her and brought her into the ark with him. 10He waited another seven days, and again he sent forth the dove out of the ark. 11And the dove came back to him in the evening, and behold, in her mouth was a freshly plucked olive leaf. So Noah knew that the waters had subsided from the earth.