Go not up, for the Lord is not among you. — Moses had already received the command which is contained in Numbers 14:25. He knew, therefore, that the Israelites would not have the guidance of the cloud, the visible token of the Divine presence.
Related Commentaries of Numbers 14:42
Numbers 14:42
42 Go not up, for the LORD is not among you; that ye be not smitten before your enemies.