Exodus 40:34-38

34Then the ⌞column of⌟ smoke covered the tent of meeting, and the glory of the Lord filled the tent.

35Moses couldn’t go into the tent of meeting, because the smoke settled on it and the glory of the Lord filled the tent.

36In all their travels, whenever the ⌞column of⌟ smoke moved from the tent, the Israelites would break camp.

37But if the column didn’t move, they wouldn’t break camp.

38So the Lord’s column stayed over the tent during the day, and there was fire in the smoke at night. In this way all the Israelites could see the column throughout their travels.