Numbers 18:4-6 English Standard Version Anglicised (ESVUK)
4 They shall join you and keep guard over the tent of meeting for all the service of the tent, and no outsider shall come near you. 5 And you shall keep guard over the sanctuary and over the altar, that there may never again be wrath on the people of Israel. 6 And behold, I have taken your brothers the Levites from among the people of Israel. They are a gift to you, given to the Lord, to do the service of the tent of meeting.