It is narrated from Harith al-A'war that Sayyiduna Ali (may Allah be pleased with him) said: It was submitted to the Messenger of Allah (peace and blessings be upon him): After you, it is possible that your Ummah may be afflicted with tribulations. Sayyiduna Ali (may Allah be pleased with him) said, they asked the Messenger of Allah (peace and blessings be upon him), or it was asked from the Messenger of Allah (peace and blessings be upon him), what is the way out from these tribulations? He (peace and blessings be upon him) said: "The way out from it is the honorable Book of Allah (which falsehood cannot approach, neither from before it nor from behind it, it is sent down from the Wise, the Praiseworthy... Fussilat 41:42), whoever seeks guidance in anything other than it, Allah will misguide him, whoever is made a ruler over an affair and judges without it, Allah will break him, it is the wise reminder, the clear light, and the straight path. In it is the news of those before you and information about those who will come after you, and it is the judge among you, decisive, not jesting. This Qur'an is such that when the jinn heard it, they could not refrain from saying, 'We have heard a marvelous Qur'an, which guides to the right path.' [الجن 1/72]
It does not become old by repeated recitation (that is, a person does not get bored of it), its lessons do not end, nor do its wonders ever cease." Then Sayyiduna Ali (may Allah be pleased with him) said to Harith al-A'war: Memorize this, O A'war.