Exodus 33:9-11

Whenever Moses entered the tent, the pillar of cloud would descend and stand at the doorway of the tent; and the LORD would speak with Moses. When all the people saw the pillar of cloud standing at the tent door, all the people would rise and worship, each at his tent door. And so 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 attendant Joshua, the son of Nun, a young man, would not depart from the tent.