Genesis 8:3-7

and the water receded steadily from the earth, and at the end of 150 days the water decreased.

Then in the seventh month, on the seventeenth day of the month, the ark rested upon the mountains of Ararat.

And the water decreased steadily until the tenth month; in the tenth month, on the first day of the month, the tops of the mountains became visible.

Then it came about at the end of forty days, that Noah opened the window of the ark which he had made;

and he sent out a raven, and it flew here and there until the water was dried up from the earth.