26:201
لَا یُؤْمِنُونَ بِهٖ حَتّٰى یَرَوُا الْعَذَابَ الْاَلٖیمَۙ
La yuminoona bihi hatta yarawoo alAAathaba alaleema
Translations
They will not believe in it until they see the painful punishment
Saheeh International
They will not believe in it till they behold the painful doom
Marmaduke Pickthall