Surah Al-Ahzab 33:68

رَبَّنَآ ءَاتِهِمْ ضِعْفَيْنِ مِنَ ٱلْعَذَابِ وَٱلْعَنْهُمْ لَعْنًا كَبِيرًا

Our Lord, give them double the punishment and curse them with a great curse."

Translation: Saheeh International

Tafsir

Our Lord give them a double chastisement in other words twice the like of our chastisement and curse them chastise them with numerous curses!’ with the equivalent number of chastisements la‘nan kathīran ‘numerous curses’ is also read la‘nan kabīran which means ‘with a mighty curse’.

Excerpt from Tafsir al-Jalalayn, commentary on 33:68, via Quran.com. The reader has the full commentary and 9 more tafsirs.