Surah Al-Baqarah, ayah 24

فَإِن لَّمۡ تَفۡعَلُواْ وَلَن تَفۡعَلُواْ فَٱتَّقُواْ ٱلنَّارَ ٱلَّتِي وَقُودُهَا ٱلنَّاسُ وَٱلۡحِجَارَةُۖ أُعِدَّتۡ لِلۡكَٰفِرِينَ ٢٤

Fa il lam taf'alū walan taf'alū fattaqun-nāral-latī waqūduhan-nāsu wal-hijāratu u'iddat lil-kāfirīn

But if you do not - and you will never be able to - then fear the Fire, whose fuel is people and stones, prepared for the disbelievers.