Exodus 33:9-11

As Moses went into the tent, the pillar of cloud would come down and stay at the entrance, while the LORD spoke with Moses. Whenever the people saw the pillar of cloud standing at the entrance to the tent, they all stood and worshiped, each at the entrance to their tent. The LORD would speak to Moses face to face, as one speaks to a friend. Then Moses would return to the camp, but his young aide Joshua son of Nun did not leave the tent.