'Pillar of Fire' in the Bible

and leddest them in the daytime in a cloudy pillar; and on the night season in a pillar of fire, to show them light in the way that they went.

yet thou forsookest them not in the wilderness, according to thy great mercy. And the cloudy pillar departed not from them in the daytime to lead them the way, neither the pillar of fire in the night season, to show them light in the way that they went.