LXX Num 3:38

Καὶ οἱ βάλλοντες κατὰ πρόσωπον τῆς σκηνῆς τοῦ μαρτυρίου ἀπ’ ἀν’ Μωυσῆς καὶ Ἀαρὼν καὶ οἱ υἱοὶ αὐτοῦ, φυλάσσοντες τὰς φυλακὰς τοῦ ἁγίου εἰς τὰς φυλακὰς τῶν υἱῶν Ἰσραήλ· καὶ ὁ ἀλλουγενὴς ὁ ἁπτόμενος ἀποθανεῖται.

Moses, Aaron, and Aaron’s sons were to camp to the east of the tabernacle, toward the sunrise, before the Tent of Meeting. They were to perform the duties of the sanctuary as a service on behalf of the Israelites; but any outsider who approached the sanctuary was to be put to death.