Exodus 40:34-38

³⁴Then the cloud covered the tent of meeting, and the glory of the LORD filled the tabernacle. ³⁵And Moses was not able to enter the tent of meeting, because the cloud abode upon it, and the glory of the LORD filled the tabernacle. ³⁶Throughout all their journeys, whenever the cloud was taken up from over the tabernacle, the people of Israel would go onward; ³⁷but if the cloud was not taken up, then they did not go onward till the day that it was taken up. ³⁸For throughout all their journeys the cloud of the LORD was upon the tabernacle by day, and fire was in it by night, in the sight of all the house of Israel.