Exodus 13:21,22
And the LORD went before them by day in a pillar of a cloud, to lead them the way; and by night in a pillar of fire, to give them light; to go by day and night:
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Exodus 14:19,20
And the angel of God, which went before the camp of Israel, removed and went behind them; and the pillar of the cloud went from before their face, and stood behind them:
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Exodus 19:9,16
And the LORD said to Moses, See, I come to you in a thick cloud, that the people may hear when I speak with you, and believe you for ever. And Moses told the words of the people to the LORD.
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