Numbers 10:11, 33-34

Now it came to pass on the twentieth day of the second month, in the second year, that the cloud was taken up from above the tabernacle of the Testimony.

So they departed from the mountain of the LORD on a journey of three days; and the ark of the covenant of the LORD went before them for the three days’ journey, to search out a resting place for them. And the cloud of the LORD was above them by day when they went out from the camp.