Kommentar zu Bamidbar 14:42

אל תעלו כי אין ה׳ בקרבכם, "do not go up for G'd is not in your midst." Moses gave two reasons why the מעפילים should not attempt to invade the land of Canaan. 1) G'd was not in their midst. 2) Seeing that G'd was not in their midst, i.e. had not approved their plan, any attempt to invade the land of Canaan now would be an act of rebellion against G'd. You will find that Moses spells this out in Deut. 1,43 when he recalled to the new generation that he had warned their fathers at the time not to attempt to invade the land and thereby to rebel against G'd.