Musannaf Ibn Abi Shayba 22:97

Abu Mu’awiyah al-Hajari narrated to us, from Abu al-Ahwas, from Abdullah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Indeed, this Qur’an is the banquet of Allah, so learn from the banquet of Allah as much as you are able. Indeed, this Qur’an is the rope of Allah, and it is the clear light and the beneficial healing. It is a protection for whoever holds fast to it, and a salvation for whoever follows it. It does not become crooked so that it must be straightened, and it does not deviate so that it must be corrected. Its wonders do not come to an end, and it does not wear out from frequent repetition."