Ash-Shu'araa • EN-AL-JALALAYN
﴿ فَيَأْتِيَهُم بَغْتَةًۭ وَهُمْ لَا يَشْعُرُونَ ﴾
“that will come upon them [on resurrection,] all of a sudden, without their being aware [of its approach];”
so that it will come upon them suddenly while they are not aware.