'Pillar of Cloud' in the Bible

And the Lord went before them by day in a pillar of cloud, guiding them on their way; and by night in a pillar of fire to give them light: so that they were able to go on day and night:

The pillar of cloud went ever before them by day, and the pillar of fire by night.

Then the angel of God, who had been before the tents of Israel, took his place at their back; and the pillar of cloud, moving from before them, came to rest at their back:

And whenever Moses went into the Tent, the pillar of cloud came down, and took its place by the door of the Tent, as long as the Lord was talking with Moses.