13. For every firstborn is mine: since I struck the firstborn in the land of Egypt: I have sanctified to myself whatsoever is firstborn in Israel both of man and beast, they are mine: I am the Lord.
14. And the Lord spoke to Moses in the desert of Sinai, saying:
15. Number the sons of Levi by the houses of their fathers and their families, every male from one month and upward.
16. Moses numbered them as the Lord had commanded.