It is narrated from the grandfather of Abdullah bin Mughith (may Allah be pleased with him); he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "A man will emerge from the two Kahin (tribes) who will teach the Qur'an in such a way that no one after him will teach it like that."
Hadith Referenceالمعجم الكبير للطبراني / باب الهاء / 18738