Charles Ellicott Commentary Numbers 9:16

"So it was alway: the cloud covered it, and the appearance of fire by night." — Numbers 9:16 (ASV)

The cloud covered it by day. —There is no need for the insertion of the words in italics. It was the same cloud which was “alway” over the Tabernacle during the continuance of the journeys through the wilderness.

And the appearance of fire by night. —Better, and there was the appearance of fire by night. .