Qur'an 26:201 · Ash-Shu'araa

لَا يُؤْمِنُونَ بِهِۦ حَتَّىٰ يَرَوُا۟ ٱلْعَذَابَ ٱلْأَلِيمَ

(201) They will not believe in it until they see the painful punishment.