فَاِنْلَّمْتَفْعَلُوْاوَلَنْتَفْعَلُوْافَاتَّقُواالنَّارَالَّتِيْوَقُوْدُهَاالنَّاسُوَالْحِجَارَةُاُعِدَّتْلِلْكٰفِرِيْنَ٢٤
fa‑in lam taf'aluu walan taf'aluu fattaquu alnnaara allatii waquuduhaa alnnaasu waalhijaaratu u'iddat lilkaafiriina
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. [24]
— Sahih International