"They want to extinguish the light of Allah with their mouths," meaning: by their denial and their fighting. His light is Islam and the Quran; they wanted to extinguish it so that there would be no faith.
﴿يُرِيدُونَ لِيُطْفِئُوا نُورَ اللَّهِ بِأَفْوَاهِهِمْ﴾ أَي: بتكذيبهم وبقتالهم، ونوره: الْإِسْلَام وَالْقُرْآن، أَرَادوا أَن يطفئوه؛ حَتَّى لَا يكون إِيمَان
