Genesis 7:2

And of the clean cattle take in to you sevens, male and female, and of the unclean cattle pairs male and female.

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.

You shall take seven pairs of every clean animal with you, the male and his female. Of the animals that are not clean, take two, the male and his female.