Numbers 3:7; Numbers 3:8; Numbers 3:38

7 They shall keep guard over him and over the whole congregation before the tent of meeting, as they minister at the tabernacle.

8 They shall guard all the furnishings of the tent of meeting, and keep guard over the people of Israel as they minister at the tabernacle.

38 Those who were to camp before the tabernacle on the east, before the tent of meeting toward the sunrise, were Moses and Aaron and his sons, guarding the sanctuary itself, to protect the people of Israel. And any outsider who came near was to be put to death.