Numbers 18:1-3

New Revised Standard Version, Anglicised

Responsibility of Priests and Levites

18 The Lord said to Aaron: You and your sons and your ancestral house with you shall bear responsibility for offences connected with the sanctuary, while you and your sons alone shall bear responsibility for offences connected with the priesthood. ² So bring with you also your brothers of the tribe of Levi, your ancestral tribe, in order that they may be joined to you, and serve you while you and your sons with you are in front of the tent of the covenant.^{[a] 3} They shall perform duties for you and for the whole tent. But they must not approach either the utensils of the sanctuary or the altar, otherwise both they and you will die.