Numbers 18:3-6

3And they shall keep thy charge, and the charge of all the tabernacle: only they shall not come nigh the vessels of the sanctuary and the altar, that neither they, nor ye also, die.

4And they shall be joined unto thee, and keep the charge of the tabernacle of the congregation, for all the service of the tabernacle: and a stranger shall not come nigh unto you.

5And ye shall keep the charge of the sanctuary, and the charge of the altar: that there be no wrath any more upon the children of Israel.

6And I, behold, I have taken your brethren the Levites from among the children of Israel: to you they are given as a gift for Yhwh, to do the service of the tabernacle of the congregation.