15:2 rubamaa yawad-dul-ladhiyna kafaruu law kaanuu muslimiyn

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Ahmed Raza Khan: Mohammed Aqib Qadri:
The disbelievers will ardently wish that if only they had been Muslims! ( At the time of death / in their graves / on the Day of Resurrection.)

Yusuf Ali:
Again and again will those who disbelieve, wish that they had bowed (to Allah's will) in Islam.

Pickthal:
It may be that those who disbelieve wish ardently that they were Muslims.