وَلَوْ جَاۤءَتْهُمْ كُلُّ اٰيَةٍ حَتّٰى يَرَوُا الْعَذَابَ الْاَلِيْمَ

wa lau jā'athum kullu āyatin ḥattā yarawul-‘ażābal-alīm(a).

even if every sign comes to them, until they see the painful punishment.