Genesis 7:1, 4, 18-19

Then the LORD said to Noah, “Go into the ark, you and all your household, for I have seen that you are righteous before me in this generation.

For in seven days I will send rain on the earth forty days and forty nights, and every living thing that I have made I will blot out from the face of the ground.”

The waters prevailed and increased greatly on the earth, and the ark floated on the face of the waters. And the waters prevailed so mightily on the earth that all the high mountains under the whole heaven were covered.