Exodus 40:34-38

Then the cloud [the Shekinah, God’s visible, dwelling presence] covered the Tent of Meeting, and the glory and brilliance of the LORD filled the tabernacle. [Rev 15:8] Moses was not able to enter the Tent of Meeting because the cloud remained on it, and the glory and brilliance of the LORD filled the tabernacle. In all their journeys, whenever the cloud was taken up from over the tabernacle, the Israelites would set out; but if the cloud was not taken up, then they did not journey on until the day when it was taken up. For throughout all their journeys, the cloud of the LORD was on the tabernacle by day, and there was fire in it by night, in the sight of all the house of Israel.