2:24
فَاِنْ لَمْ تَفْعَلُوا وَلَنْ تَفْعَلُوا فَاتَّقُوا النَّارَ الَّتٖی وَقُودُهَا النَّاسُ وَالْحِجَارَةُۚ اُعِدَّتْ لِلْكَافِرٖینَ
Fain lam tafAAaloo walan tafAAaloo faittaqoo alnnara allatee waqooduha alnnasu waalhijaratu oAAiddat lilkafireena
Translations
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
Saheeh International
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
Marmaduke Pickthall