Exodus 40:34-38

34Then the cloud covered the Tent of Meeting, and the glory of Adonai filled the Tabernacle.

35Moses was unable to enter into the Tent of Meeting, because the cloud resided there and the glory of Adonai filled the Tabernacle.

36Now whenever the cloud was taken up from over the Tabernacle, Bnei-Yisrael went onward, throughout all their journeys.

37But if the cloud was not taken up, then they did not move out until the day that it was.

38For the cloud of Adonai was on the Tabernacle by day and a fire was there by night, in the sight of all the house of Israel throughout all their journeys.