Exodus 13:21-22
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21And the Lord was going before them in a pillar of cloud by day to lead them on the way, and in a pillar of fire by night to give them light, so that they might travel by day and by night. 22He did not take away the pillar of cloud by day, nor the pillar of fire by night, from the presence of the people.
Exodus 13:21-22 (NASB)