Numbers 3:38

But those that encamp before the tabernacle toward the east, [even] before the tabernacle of the congregation eastward, [shall be] Moshe [He Who Draws Out Of The Waters], and Aharon [Bright, Very High] and his sons, keeping the charge of the sanctuary for the charge of the people of Yisra’el [He Holds Onto The Heel Of God]; and the stranger that comes near shall be put to death.