Exodus 33:8-11

8Whenever Moses went out to the tent, all the people would rise up, and each would stand at his tent door, and watch Moses until he had gone into the tent.

9When Moses entered the tent, the pillar of cloud would descend and stand at the entrance of the tent, and the Lord would speak with Moses.

10And when all the people saw the pillar of cloud standing at the entrance of the tent, all the people would rise up and worship, each at his tent door.

11Thus the Lord used to speak to Moses face to face, as a man speaks to his friend. When Moses turned again into the camp, his assistant Joshua the son of Nun, a young man, would not depart from the tent.