يُرِيدُونَ لِيُطْفِـُٔوا۟ نُورَ ٱللَّهِ بِأَفْوَٰهِهِمْ وَٱللَّهُ مُتِمُّ نُورِهِۦ وَلَوْ كَرِهَ ٱلْكَـٰفِرُونَ Qur’an As-Saff (61:8)Yureedoona liyutfioo noora Allahi biafwahihim waAllahu mutimmu noorihi walaw kariha alkafiroona
Lit., "with their mouths" - i.e., by describing God's message as "nothing but spellbinding eloquence" on the part of Muhammad.
Allah's Light is unquenchable. A foolish, ignorant person who thinks of extinguishing it is like a rustic who wants to blow out electric light as he might blow out a rush candle! "With their mouths" also implies the babble and cackle of Ignorance against Allah's Truth. The more the foolish ones try to quench Allah's Light, the clearer it shines, to shame them!