The Lord spoke to Moses, saying:
You will appoint Aaron and his sons, and they will attend to their priesthood, and the foreigner that approaches will be put to death.
Behold, I have taken the Levites from among the Israelites instead of all the firstborn that open the womb among the Israelites. The Levites shall be Mine,
And you will know that I have sent this command to you, that My covenant with Levi may remain, says the Lord of Hosts.