Exodus 19:9

19:9 The Lord said to Moses, “I am going to come to you in a dense cloud, so that the people may hear when I speak with you and so that they will always believe in you.” And Moses told the words of the people to the Lord.

Exodus 33:9

33:9 And 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.

Numbers 12:5

12:5 And the Lord came down in a pillar of cloud and stood at the entrance of the tent; he then called Aaron and Miriam, and they both came forward.