فَإِن لَم تَفعَلوا وَلَن تَفعَلوا فَاتَّقُوا النّارَ الَّتي وَقودُهَا النّاسُ وَالحِجارَةُ ۖ أُعِدَّت لِلكافِرينَ

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.