Numbers 3:10 BBE

⁸  And they will have the care of all the vessels of the Tent of meeting, and will do for the children of Israel all the necessary work of the House.

⁹  Give the Levites to Aaron and his sons; so that they may be his without question from among the children of Israel.

¹⁰  And give orders that Aaron and his sons are to keep their place as priests; any strange person who comes near is to be put to death.

¹¹  And the Lord said to Moses,

¹²  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;