فَإِن لَّمۡ تَفۡعَلُواْ وَلَن تَفۡعَلُواْ فَٱتَّقُواْ ٱلنَّارَ ٱلَّتِي وَقُودُهَا ٱلنَّاسُ وَٱلۡحِجَارَةُۖ أُعِدَّتۡ لِلۡكَٰفِرِينَ
Fail lam taf'aloo wa lan taf'aloo fattaqun Naaral latee waqooduhan naasu walhijaaratu u'iddat lilkaafireen
English Translation
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