Even when the cloud continued over the tabernacle many days, the people of Israel kept the charge of the LORD and did not set out.
19. Then the children kept the charge of the Lord. Some, Dathe agrees with Malvenda and other ancient commentators in adopting the opinion here rejected by C. “The sense of the passage (he says) is, that the Israelites set up the holy tabernacle, and observed the holy rites, if they were detained for many days in one place; but if for a short time only...
We have here the history of the cloud; not a natural history: who knows the balancings of the clouds? but a divine history of a cloud that was appointed to be the visible sign and symbol of God's presence with Israel. I.
Commenting on Numbers 9:15-23
And so it was, when the cloud was a few days upon the tabernacle,.... Or "days of number", which were so few that they might be easily numbered: the Targum of Jonathan interprets them of the seven days of the week, as if the sense was, when the cloud rested a week on the tabernacle: according to the commandment of the Lord they abode in...