Exodus 33:8-11

And it came about, whenever Moses went out to the tent, that all the people would arise and stand, each at the entrance of his tent, and gaze after Moses until he entered the tent. Whenever 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. When all the people saw the pillar of cloud standing at the entrance of the tent, all the people would arise and worship, each at the entrance of his tent. Thus the LORD used to speak to Moses face to face, just as a man speaks to his friend. When Moses returned to the camp, his servant Joshua, the son of Nun, a young man, would not depart from the tent.