TSK · Numbers 18:2

She conceived again, and bore a son. Said, "Now this time will my husband be joined to me, because I have borne him three sons." Therefore was his name called Levi.

You shall give the Levites to Aaron and to his sons. They are wholly given to him on the behalf of the children of Israel.

I have given the Levites as a gift to Aaron and to his sons from among the children of Israel, to do the service of the children of Israel in the Tent of Meeting, and to make atonement for the children of Israel; that there be no plague among the children of Israel, when the children of Israel come near to the sanctuary."

to be a memorial to the children of Israel, to the end that no stranger, who isn't of the seed of Aaron, comes near to burn incense before Yahweh; that he not be as Korah, and as his company: as Yahweh spoke to him by Moses.

They shall be joined to you, and keep the responsibility of the Tent of Meeting, for all the service of the Tent: and a stranger shall not come near to you.

They stood in their place after their order, according to the law of Moses the man of God: the priests sprinkled the blood [which they received] of the hand of the Levites.

You will know that I have sent this commandment to you, that my covenant may be with Levi," says Yahweh of Armies.