Genesis 7:4 KJV

2Of every clean beast thou shalt take to thee by sevens, the male and his female: and of beasts that are not clean by two, the male and his female.

3Of fowls also of the air by sevens, the male and the female; to keep seed alive upon the face of all the earth.

4For yet seven days, and I will cause it to rain upon the earth forty days and forty nights; and every living substance that I have made will I destroy from off the face of the earth.

5And Noah did according unto all that the LORD commanded him.

6And Noah was six hundred years old when the flood of waters was upon the earth.