And the Lord said to Moses,See, I have taken the Levites out of the children of Israel to be mine in place of the first sons of the children of Israel;For all the first sons are mine; on the day when I put to death all the first sons in the land of Egypt, I took for myself every first male birth of man and beast. They are mine; I am the Lord.And he gave the money to Aaron and his sons, as the Lord had said.[Numbers3:11~13,51]