Surah Al-Mursalat 77:7

إِنَّمَا تُوعَدُونَ لَوَٰقِعٌ

Indeed, what you are promised is to occur.

Translation: Saheeh International

Tafsir

Surely that which you are promised O disbelievers of Mecca in the way of resurrection and chastisement will befall it will be without any doubt.

Excerpt from Tafsir al-Jalalayn, commentary on 77:7, via Quran.com. The reader has the full commentary and 9 more tafsirs.