The Levites have been completely given over to me by the Israelites. I have accepted them as mine in place of all the firstborn sons of the Israelites.
because all the firstborn are mine. When I killed every firstborn in Egypt I set apart as holy to me all the firstborn of Israel, human and animal. They are mine. I am the Lord.”
“You are to take the Levites in place of all the firstborn children of Israel, and the livestock of the Levites in place of their livestock, because the Levites belong to me. I am the Lord.