“And the dove came in to him in the evening; and, lo, in her mouth was an olive leaf pluckt off: so Noah knew that the waters were abated from off the earth.”
Genesis 8:11 (KJV)

“Also he sent forth a dove from him, to see if the waters were abated from off the face of the ground;
But the dove found no rest for the sole of her foot, and she returned unto him into the ark…
And he stayed yet other seven days; and again he sent forth the dove out of the ark;
And the dove came in to him in the evening; and, lo, in her mouth was an olive leaf pluckt off: so Noah knew that the waters were abated from off the earth.”
Genesis 8:8-11 (KJV)