Surah Al-Baqarah, Verse 24

فَإِن لَّمۡ تَفۡعَلُواْ وَلَن تَفۡعَلُواْ فَٱتَّقُواْ ٱلنَّارَ ٱلَّتِي وَقُودُهَا ٱلنَّاسُ وَٱلۡحِجَارَةُۖ أُعِدَّتۡ لِلۡكَٰفِرِينَ٢٤

fa-in lam tafʿalū walan tafʿalū fa-ittaqū l-nāra allatī waqūduhā l-nāsu wal-ḥijāratu uʿiddat lil'kāfirīna

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.