[Allāh] said, "Then indeed, it is forbidden to them for forty years [in which] they will wander throughout the land. So do not grieve over the defiantly disobedient people."
Allah said to His Prophet Moses (peace be upon him), ‘Allah has forbidden entry into the Holy Land for the Israelites for a period of forty years, in which they will wander on earth aimlessly without direction. Do not grieve, O Moses, over those who do not follow Allah, because the punishment they receive is because of their sins’.