Exodus 40:35

33He raised up the court around the tabernacle and the altar, and set up the screen of the gate of the court. So Moses finished the work.

34Then the cloud covered the Tent of Meeting, and the LORD’s glory filled the tabernacle.

35Moses wasn’t able to enter into the Tent of Meeting, because the cloud stayed on it, and the LORD’s glory filled the tabernacle.

36When the cloud was taken up from over the tabernacle, the children of Israel went onward, throughout all their journeys;

37but if the cloud wasn’t taken up, then they didn’t travel until the day that it was taken up.