Quran 29:53 Al-'Ankabut, ayah 53 of 69

وَيَسْتَعْجِلُونَكَ بِٱلْعَذَابِ ۚ وَلَوْلَآ أَجَلٌ مُّسَمًّى لَّجَآءَهُمُ ٱلْعَذَابُ وَلَيَأْتِيَنَّهُم بَغْتَةً وَهُمْ لَا يَشْعُرُونَ ۝٥٣

29:53 They bid thee hasten on the doom (of Allah). And if a term had not been appointed, the doom would assuredly have come unto them (ere now). And verily it will come upon them suddenly when they perceive not.