Numbers 3:6-9

6 aBring the tribe of Levi near, and set them before Aaron the priest, that they may minister to him. 7They shall keep guard over him and over the whole congregation before the tent of meeting, bas they minister at the tabernacle. 8They shall guard all the furnishings of the tent of meeting, and keep guard over the people of Israel as they minister at the tabernacle. 9And cyou shall give the Levites to Aaron and his sons; they are dwholly given to him from among the people of Israel.

Numbers 3:38

38Those 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, eguarding the sanctuary itself, to protect
Hebrew guard
the people of Israel. And any outsider who came near was to be put to death.
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