15:2
رُّبَمَا يَوَدُّ ٱلَّذِينَ كَفَرُوا۟ لَوْ كَانُوا۟ مُسْلِمِينَ
rubamā yawaddu alladhīna kafarū law kānū mus'limīna
Perhaps those who disbelieve will wish that they had been Muslims.
— Saheeh International
The disbelievers may well come to wish they had submitted to God,
— M. A. S. Abdel Haleem
How much would those who disbelieved wish that they had been Muslims [those who have submitted themselves to Allâh’s Will in Islâm i.e. Islâmic Monotheism - this will be on the Day of Resurrection when they will see the disbelievers going to Hell and the Muslims going to Paradise].
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali