Exodus 13:21-22

Young's Literal Translation

²¹ and Jehovah is going before them by day in a pillar of a cloud, to lead them in the way, and by night in a pillar of fire, to give light to them, to go by day and by night;

²² He removeth not the pillar of the cloud by day, and the pillar of the fire by night, [from] before the people.