Exodus 40:36-38

36Throughout their journeys, 1whenever the cloud was taken up from over the tabernacle, the sons of Israel would set out;

37but 2if the cloud was not taken up, then they did not set out until the day when it was taken up.

38For throughout their journeys, 3the 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.