فَإِن لَّمۡ تَفۡعَلُواْ وَلَن تَفۡعَلُواْ فَٱتَّقُواْ ٱلنَّارَ ٱلَّتِي وَقُودُهَا ٱلنَّاسُ وَٱلۡحِجَارَةُۖ أُعِدَّتۡ لِلۡكَٰفِرِينَ ٢٤
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.
Translation: Saheeh International (English)
Each word's meaning and sound
If they are unable to do so – and they will never be able to do it – they should be mindful of the fire of Hell, which burns with people who deserve the torment, and with the idols which they used to worship instead of Allah: punishing both the idol-worshipers and what they worshiped. The fire of Hell has been prepared as a punishment for the disbelievers.
Al-Mukhtasar in interpreting the Noble Quran