Al-Ma'idah 5:26

Qala fa-innaha muharramatunAAalayhim arbaAAeena sanatan yateehoona fee al-ardi falata/sa AAala alqawmi alfasiqeen

[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."

He (Allah) said, “This (land) is prohibited to them for forty years. They shall be wandering around the earth. So, do not grieve for the sinning people.”