Of clean fowls, which he leaves to be understood out of the foregoing verse, by sevens; and of the unclean, by two; as before of the beasts, to keep seed alive, i.e. the issue or breed of them.
Related Commentaries of Genesis 7:3
Genesis 7:3
3 Of fowls also of the air by sevens,b the male and the female; to keep seed alive upon the face of all the earth.