Surah Al-Baqara, Verse 24
فَإِن لَّمْ تَفْعَلُوا۟ وَلَن تَفْعَلُوا۟ فَٱتَّقُوا۟ ٱلنَّارَ ٱلَّتِى وَقُودُهَا ٱلنَّاسُ وَٱلْحِجَارَةُ ۖ أُعِدَّتْ لِلْكَٰفِرِينَ
Translation — Sahih International
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.
Source
Kur'an-ı Kerim, Bakara Suresi 2:24
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/2-suresi-24-ayet