Numbers 9:20-22 New International Version - UK (NIVUK)
20 Sometimes the cloud was over the tabernacle for only a few days; at the Lord’s command they would set up camp, and then at his command they would set out. 21 Sometimes the cloud stayed only from evening till morning, and when it lifted in the morning, they set out. Whether by day or by night, whenever the cloud lifted, they set out. 22 Whether the cloud stayed over the tabernacle for two days or a month or a year, the Israelites would remain in camp and not set out; but when it lifted, they would set out.