وَلَوْ جَاۤءَتْهُمْ كُلُّ اٰيَةٍ حَتّٰى يَرَوُا الْعَذَابَ الْاَلِيْمَ

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

even though dem receive signs (of Allah's greatness), until dem witness a painful punishment.