Surah Al-Ma'idah 5:26

قَالَ فَإِنَّهَا مُحَرَّمَةٌ عَلَيْهِمْ ۛ أَرْبَعِينَ سَنَةً ۛ يَتِيهُونَ فِى ٱلْأَرْضِ ۚ فَلَا تَأْسَ عَلَى ٱلْقَوْمِ ٱلْفَـٰسِقِينَ

[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."

Translation: Saheeh International

Tafsir

He God exalted be He said to him ‘Then it the Holy Land shall be forbidden them to enter for forty years; they shall wander lost bewildered in the land — according to Ibn ‘Abbās this land was about nine parasangs sc. 30 miles; so do not grieve for the wicked folk’. …

Excerpt from Tafsir al-Jalalayn, commentary on 5:26, via Quran.com. The reader has the full commentary and 9 more tafsirs.