Leviticus 12:1

And the Lord spake unto Moses,.... The laws in the preceding chapter were delivered both to Moses and Aaron, but what follows in this only to Moses; but inasmuch as the priest had a concern in it, it being his business to offer the sacrifices required by the following law, it was no doubt given to Moses, to be delivered to Aaron, as well as to the people. R. Semlai remarks, that as the creation of man was after that of the beasts, fowls, fishes, c. so the laws concerning the uncleanness of men are after those relating to beasts, c, and they begin with the uncleanness of a new mother, because, as Aben Ezra observes, the birth is the beginning of man:

saying: as follows.