Surah Al-'Ankabut 29:53

وَيَسْتَعْجِلُونَكَ بِٱلْعَذَابِ ۚ وَلَوْلَآ أَجَلٌ مُّسَمًّى لَّجَآءَهُمُ ٱلْعَذَابُ وَلَيَأْتِيَنَّهُم بَغْتَةً وَهُمْ لَا يَشْعُرُونَ

And they urge you to hasten the punishment. And if not for [the decree of] a specified term, punishment would have reached them. But it will surely come to them suddenly while they perceive not.

Translation: Saheeh International

Tafsir

And they ask you to hasten the chastisement. Yet were it not for an appointed term for this chastisement the chastisement would have come upon them before long but it shall assuredly come upon them suddenly while they are unaware of the time of its coming.

Excerpt from Tafsir al-Jalalayn, commentary on 29:53, via Quran.com. The reader has the full commentary and 9 more tafsirs.