Genesis 7:1-3

Then the LORD said to Noah, “Enter the ark, you and all your household, for you alone I have seen to be righteous before Me in this time. You shall take with you of every clean animal by sevens, a male and his female; and of the animals that are not clean two, a male and his female; also of the birds of the sky, by sevens, male and female, to keep offspring alive on the face of all the earth.