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Genesis 7:2
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.
Genesis 7:3
Of fowls also of the air by sevens, the male and the female; to keep seed alive upon the face of all the earth.
Genesis 7:8
Of clean beasts, and of beasts that are not clean, and of fowls, and of every thing that creepeth upon the earth,
Genesis 7:9
There went in two and two unto Noah into the ark, the male and the female, as God had commanded Noah.