This chapter would more naturally follow the 15th chapter of Leviticus. See the note to Leviticus 15:1.

Who shall offer it. —Better, and he shall offer it, that is, the priest shall offer the sin offering. Though two sacrific…

Who shall offer it before the Lord
Upon the altar of burnt offering:

and make an atonement for he…

After the laws concerning clean and unclean food, come the laws concerning clean and unclean persons. Man imparts his depraved nature to his offspr…