Surah Ash-Shu'ara 26:202
فَيَأْتِيَهُم بَغْتَةً وَهُمْ لَا يَشْعُرُونَ
And it will come to them suddenly while they perceive [it] not.
Translation: Saheeh International
Tafsir
so that it will come upon them suddenly while they are not aware.
Excerpt from Tafsir al-Jalalayn, commentary on 26:202, via Quran.com. The reader has the full commentary and 9 more tafsirs.