The motion or stay of the cloud is fitly called the command of God, because it was a signification of God's will and their duty, which a command properly is.
Related Commentaries of Numbers 9:18
Numbers 9:18
18 At the commandment of the LORD the children of Israel journeyed, and at the commandment of the LORD they pitched: as long as the cloud abode upon the tabernacle they rested in their tents.