'Pillar of Fire' in the Bible

You guided them with a pillar of cloud by day and with a pillar of fire by night to illumine for them the path they were to travel.

"Due to your great compassion you did not abandon them in the desert. The pillar of cloud did not stop guiding them in the path by day, nor did the pillar of fire stop illuminating for them by night the path on which they should travel.