Who shall not acknowledge it as the truth personified until they have - Surah Ash-Shu‘ara’ ayat 201 in Tafsir

﴿لَا يُؤۡمِنُونَ بِهِۦ حَتَّىٰ يَرَوُاْ ٱلۡعَذَابَ ٱلۡأَلِيمَ ﴾
[الشعراء: 201]

Who shall not acknowledge it as the truth personified until they have had the wind in their faces and they are face to face with the promised punishment here, at the hands of the Muslims or with the torment laid upon the damned Hereafter

﴿لا يؤمنون به حتى يروا العذاب الأليم﴾ [الشعراء: 201]

Dr Kamal Omar
they will not Believe in it until they see the painful torment

Dr Laleh Bakhtiar
They will not believe in it until they see the painful punishment

Dr Munir Munshey
They will not believe, right until they see that painful punishment

Edward Henry Palmer
they will not believe therein until they see the grievous woe

Farook Malik
They are not going to believe in it until they see the painful scourge

George Sale
They shall not believe therein, until they see a painful punishment

Maududi
They will not believe in it until they clearly see the grievous chastisement