Musannaf Ibn Abi Shaybah 37553 — The words of Abu Musa

It is narrated from Abu al-Aswad that he said: Sayyiduna Abu Musa (may Allah be pleased with him) gathered the reciters of the Qur'an. He (may Allah be pleased with him) said: Let no one come here except one who has memorised the Qur'an. The narrator said: We gathered, about three hundred men. He (may Allah be pleased with him) admonished us and said: You are the reciters of this city. Let not the time grow long for you, or your hearts will harden just as the hearts of the People of the Book hardened.