Jamieson, Fausset and Brown on Numbers 9:15

Nu 9:15-23. A Cloud Guides the Israelites.

15. the cloud covered the tabernacle--The inspired historian here enters on an entirely new subject, which might properly have formed a separate chapter, beginning at this verse and ending at Nu 10:29 [Calmet]. The cloud was a visible token of God's special presence and guardian care of the Israelites (Ex 14:20; Psa 105:39). It was easily distinguishable from all other clouds by its peculiar form and its fixed position; for from the day of the completion of the tabernacle it rested by day as a dark, by night as a fiery, column on that part of the sanctuary which contained the ark of the testimony (Le 16:2).