Genesis 7:4

²  Of 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.

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

⁴  For 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.

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

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