'Pillar' in the Bible

Moreover, in a pillar of cloud you led them by day; and in a pillar of fire by night, to give them light in the way in which they should go.

yet you in your manifold mercies didn't forsake them in the wilderness: the pillar of cloud didn't depart from over them by day, to lead them in the way; neither the pillar of fire by night, to show them light, and the way in which they should go.