章 13 Ar-Ra'd (The Thunder), 节 43
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وَيَقُولُ الَّذِينَ كَفَرُوا لَسْتَ مُرْسَلًا ۚ قُلْ كَفَىٰ بِاللَّهِ شَهِيدًا بَيْنِي وَبَيْنَكُمْ وَمَنْ عِنْدَهُ عِلْمُ الْكِتَابِ
And those who have disbelieved say, "You are not a messenger." Say, (O Muhammad), "Sufficient is Allah as Witness between me and you, and (the witness of) whoever has knowledge of the Scripture."
13:43
Translation: Saheeh International