Exodus 40:36-38

Young's Literal Translation

³⁶ And in the going up of the cloud from off the tabernacle the sons of Israel journey in all their journeys;

³⁷ and if the cloud go not up then they journey not, until the day of its going up:

³⁸ for the cloud of Jehovah [is] on the tabernacle by day, and fire is in it by night, before the eyes of all the house of Israel in all their journeys.