And the Lord spake unto Moses Continued to speak unto him, and give him the reason of his appointing the Levites to minister to the priests and serve the tabernacle:
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Assign the Levites to Aaron and his sons; they have been assigned exclusively to him from the Israelites.
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You are to appoint Aaron and his sons to carry out their priestly responsibilities, but any unauthorized person who comes near [the sanctuary] must be put to death."
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"See, I have taken the Levites from the Israelites in place of every firstborn Israelite from the womb. The Levites belong to Me,
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because every firstborn belongs to Me. At the time I struck down every firstborn in the land of Egypt, I consecrated every firstborn in Israel to Myself, both man and animal; they are Mine; I am the Lord."