Genesis 7:16-20

Those that entered, male and female of all flesh, entered as God had commanded him; and the Lord closed the door behind him.

Then the flood came upon the earth for forty days, and the water increased and lifted up the ark, so that it rose above the earth.

The water prevailed and increased greatly upon the earth, and the ark floated on the surface of the water.

And the water prevailed more and more upon the earth, so that all the high mountains everywhere under the heavens were covered.

The water prevailed fifteen cubits higher, and the mountains were covered.