Numbers 1:51
51 When the tabernacle is to set out, the Levites shall jtake it down, and when the tabernacle is to be pitched, the Levites shall kset it up. And lif any outsider comes near, he shall be put to death.
Numbers 3:38
38 Those who were to camp before the tabernacle qon the east, before the tent of meeting toward the sunrise, were Moses and Aaron and his sons, rguarding the sanctuary itself, to protect1 the people of Israel. And sany outsider who came near was to be put to death.