Even if every sign should come to them, until they see the painful punishment.
The Saheeh International Quran Translation
وَلَوْ جَآءَتْهُمْ كُلُّ ءَايَةٍ حَتَّىٰ يَرَوُا۟ ٱلْعَذَابَ ٱلْأَلِيمَEven if every sign should come to them, until they see the painful punishment.