'Pillar of Cloud' in the Bible

Then Yahweh came down in a pillar of cloud, and stood at the entrance of the tent, - and called Aaron and Miriam, and they both went forth.

And will tell it unto the inhabitants of this land: They have heard, That, thou, Yahweh, art in the midst of this people, - That eye to eye, is he seen - thou, Yahweh, And thy cloud, is standing over them, And in a pillar of cloud, thou thyself, art going on before them by day, And in a pillar of fire, by night.