Exodus 13:21

13:21 Now the Lord was going before them by day in a pillar of cloud to lead them in the way, and by night in a pillar of fire to give them light, so that they could travel day or night.

Exodus 40:38

40:38 For the cloud of the Lord was on the tabernacle by day, but fire would be on it at night, in plain view of all the house of Israel, throughout all their journeys.