Surah Al-Ankabut (The Spider), Verse 53

وَیَسْتَعْجِلُوْنَكَ بِالْعَذَابِ وَلَوْلَاۤ اَجَلٌ مُّسَمًّی لَّجَآءَهُمُ الْعَذَابُ وَلَیَاْتِیَنَّهُمْ بَغْتَةً وَّهُمْ لَا یَشْعُرُوْنَ ۟

Wa yasta'jiloonaka bil'azaab; wa law laaa ajalum musammal lajaaa'ahumul a'zaab; wa la ya'tiannahum baghta tanw wa hum laa yash'uroon

“They ask thee to hasten on the Punishment (for them): had it not been for a term (of respite) appointed, the Punishment would certainly have come to them: and it will certainly reach them,- of a sudden, while they perceive not!”

Quran 29:53 (Yusuf Ali Translation)