Exodus 33:11
10 When all the people would see the pillar of cloud standing at the entrance of the tent, all the people, each one at the entrance of his own tent, would rise and worship. 11 The Lord would speak to Moses face to face, the way a person speaks to a friend. Then Moses would return to the camp, but his servant, Joshua son of Nun, a young man, did not leave the tent. 12 Moses said to the Lord, “See, you have been saying to me, ‘Bring this people up,’ but you have not let me know whom you will send with me. But you said, ‘I know you by name, and also you have found favor in my sight.’
Numbers 1:51
50 But appoint the Levites over the tabernacle of the testimony, over all its furnishings and over everything in it. They must carry the tabernacle and all its furnishings; and they must attend to it and camp around it. 51 Whenever the tabernacle is to move, the Levites must take it down, and whenever the tabernacle is to be reassembled, the Levites must set it up. Any unauthorized person who approaches it must be killed. 52 “The Israelites will camp according to their divisions, each man in his camp, and each man by his standard.
Notes and References
"... Exodus 33:11 ... Here in E Joshua is pictured as being inside the Tent of Meeting. But this is a contradiction of P, where it is forbidden for anyone who is not a priest ever to be in the Tent, the penalty for which is to be put to death (Numbers 1:51, 3:10, 38; 18:5, 7) ..."
Friedman, Richard Elliott The Bible with Sources Revealed: A New View Into the Five Books of Moses (p. 176) Harper San Francisco, 2005