Musannaf Ibn Abi Shaybah

Hazrat Qais bin Sakan narrates that Hazrat Abdullah said: Learn the Qur'an. Because for reciting one letter of the Qur'an, ten good deeds are written and ten sins are erased. Further, I do not say that "Alif Lam Meem" is one letter, but I say this: for "Alif" there are ten good deeds, for "Lam" there are ten good deeds, and for "Meem" there are ten good deeds.