It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Indeed, this Qur'an is the banquet of Allah, so take from His banquet (knowledge and guidance) as much as you are able. Indeed, this Qur'an is the firm rope of Allah, the clear light and the beneficial cure; it is a protection for whoever holds fast to it and salvation for whoever follows it. It does not deviate (from the truth) so that it would need to be reproached and made to repent, nor does it become crooked so that it would need to be straightened; its wonders never come to an end, and it does not wear out from much repetition. Recite it, for Allah will reward you for its recitation with ten good deeds for every letter. Take note: I do not say that 'Alif Lam Mim' is one letter; rather, Alif is a letter, Lam is a letter and Mim is a letter." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not use Salih bin Umar as evidence.