وَهُمْ يَنْهَوْنَ عَنْهُ وَيَنْـَٔوْنَ عَنْهُ ۖ وَإِن يُهْلِكُونَ إِلَّآ أَنفُسَهُمْ وَمَا يَشْعُرُونَ
Wa hum yanhawna 'anhu wa yan'awna 'anhu wa iny yuhlikoona illaa anfusahum wa maa yash'uroon
Dan mereka melarang (orang lain) mendengarkan Al-Qur`ān dan mereka sendiri menjauhkan diri darinya, dan mereka hanyalah membinasakan diri mereka sendiri, sedang mereka tidak menyadari.
They forbid others from it and keep away from it themselves. They destroy no one but themselves, though they do not perceive it.
The Arabic pairs two near-identical verbs, yanhawna and yan'awna: they hold others back from the message and hold themselves back from it. Early commentators read the line two ways — some applied it to Abu Talib, who shielded the Prophet while declining the message himself, others to the Quraysh leadership as a whole. Either way the closing clause stands: the damage lands on the one inflicting it.