Quran english al baqarah 24

فإن لم تفعلوا ولن تفعلوا فاتقوا النار التي وقودها الناس والحجارة أعدت للكافرين

Fa-in lam tafAAaloo walan tafAAaloo fattaqooannara allatee waqooduha annasuwalhijaratu oAAiddat lilkafireen

 
Sahih International
But if you do not - and you will never be able to - then fear the Fire, whose fuel is men and stones, prepared for the disbelievers.
Muhsin Khan
But if you do it not, and you can never do it, then fear the Fire (Hell) whose fuel is men and stones, prepared for the disbelievers.
Pickthall
And if ye do it not - and ye can never do it - then guard yourselves against the Fire prepared for disbelievers, whose fuel is of men and stones.
Yusuf Ali
But if ye cannot- and of a surety ye cannot- then fear the Fire whose fuel is men and stones,- which is prepared for those who reject Faith.
Shakir
But if you do (it) not and never shall you do (it), then be on your guard against the fire of which men and stones are the fuel; it is prepared for the unbelievers.
Dr. Ghali
So, in case you shall not perform that-and you will never perform it-then protect yourselves against the Fire whose fuel is mankind and stones, prepared for the disbelievers.