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The Tabernacle Erected and Arranged
34Then the cloud covered the tabernacle of meeting, and the glory of the Lord filled the tabernacle. 35And Moses was not able to enter the tabernacle of meeting, because the cloud rested above it, and the glory of the Lord filled the tabernacle. 36Whenever the cloud was taken up from above the tabernacle, the children of Israel would go onward in all their journeys. 37But if the cloud was not taken up, then they did not journey till the day that it was taken up. 38For the cloud of the Lord was above the tabernacle by day, and fire was over it by night, in the sight of all the house of Israel, throughout all their journeys.
Exodus 40:34-38 (NKJV)