Numbers 9:17 (KJV)

And on the day that the tabernacle was reared up the cloud covered the tabernacle, namely, the tent of the testimony: and at even there was upon the tabernacle as it were the appearance of fire, until the morning.

So it was alway: the cloud covered it by day, and the appearance of fire by night.

And when the cloud was taken up from the tabernacle, then after that the children of Israel journeyed: and in the place where the cloud abode, there the children of Israel pitched their tents.

At the commandment of the Lord the children of Israel journeyed, and at the commandment of the Lord they pitched: as long as the cloud abode upon the tabernacle they rested in their tents.

And when the cloud tarried long upon the tabernacle many days, then the children of Israel kept the charge of the Lord, and journeyed not.