Genesis 8:6 KJV

And it came to pass at the end of forty days, that Noah opened the window of the ark which he had made:
Genesis 8:6, King James Version

In context

5 And the waters decreased continually until the tenth month: in the tenth month, on the first day of the month, were the tops of the mountains seen.

6 And it came to pass at the end of forty days, that Noah opened the window of the ark which he had made:

7 And he sent forth a raven, which went forth to and fro, until the waters were dried up from off the earth.