Rashi on Exodus 13:22/רש"י על שמות י״ג:כ״ב

1לא ימיש means He — the Holy One, blessed be He — did not let depart (did not remove) את עמוד הענן יומם ועמוד האש לילה THE PILLAR OF CLOUD BY DAY NOR THE PILLAR OF FIRE BY NIGHT. — This tells us (we may gather from this) that the pillar of cloud handed over the camp to the pillar of fire and the pillar of fire handed it over to the pillar of cloud — that before the one set the other rose (Shabbat 23b).