And indeed We know that they (polytheists and pagans) say: "It is only a human being who teaches him (Muhammad SAW)." The tongue of the man they refer to is foreign, while this (the Quran) is a clear Arabic tongue.
و همانا دانیم که ایشان گویند جز این نیست که می‌آموزدش بشری زبان آنکه بدو این سخن را بندند عجمی (نارسا) است و این زبانی است عربی (رسا) آشکار