'Pillar of Fire' in the Bible

The LORD went in front of them by day in a pillar of cloud to lead them along the way, and by night in a pillar of fire to give them light, so they could travel both day and night.

Neither the pillar of cloud by day nor the pillar of fire by night left its place in front of the people.

In the morning watch, the LORD looked down on the Egyptian camp through the pillar of fire and cloud, and he threw the Egyptian camp into confusion.