Numbers 9:19-22

19Even when the cloud continued over the tabernacle many days, the people of Israel a  kept the charge of the  Lord and did not set out. 20Sometimes the cloud was a few days over the tabernacle, and according to the command of the  Lord they remained in camp; then according to the command of the  Lord they set out. 21And sometimes the cloud remained from evening until morning. And when the cloud lifted in the morning, they set out, or if it continued for a day and a night, when the cloud lifted they set out. 22Whether it was two days, or a month, or a longer time, that the cloud continued over the tabernacle, abiding there, the people of Israel b  remained in camp and did not set out, but when it lifted they set out.
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