Musnad Ahmad #665

It was narrated that Al-Harith bin Abdullah al-A’war said: I said: Ameer al-Mu`mineen will certainly come and I shall certainly ask him about what i heard tonight. After `Isha` I came to him and entered upon him, and he narrated the hadeeth. Then he said: I heard the Messenger of Allah (ﷺ) say: “Jibreel (عليه السلام) came to me and said: `O Muhammad, your ummah will differ after you are gone.` I said to him: ‘What is the solution, O Jibreel?` He said: The Book of Allah, may He be exalted, by means of which Allah will destroy every tyrant. Whoever clings to it will be saved and whoever abandons it will be doomed.` He said it twice. ‘Verily, this (the Qur`an) is the Word that separates (the truth from falsehood, and commands strict laws for mankind to cut the roots of evil). And it is not a thing for amusement` [At-Tariq 86:13-14). It does not wear out from being repeated and its wonders never end; in it is news of what came before you, judgement of what happens among you, and foretelling of what will happen after you are gone.