Numbers 3:38

vi). The Positioning of the Priests.

Numbers 3:38

‘And those who encamp before the tabernacle eastward, before the tent of meeting toward the sunrising, shall be Moses, and Aaron and his sons, keeping the charge of the sanctuary for the charge of the children of Israel, and the stranger who comes near shall be put to death.'

The Levites would be encamped to the north, the west and the south, but to the east of the Dwellingplace would be encamped Moses, and Aaron and his sons, and their households. That was where the entrance to the Dwellingplace was, and it was their responsibility to ensure that no one approached to enter, unless such approach was valid in accordance with God's Instruction.