Musannaf Ibn Abi Shaybah 31924 — The reward of one who recites

Qays bin Sakan said that Sayyiduna Abdullah (may Allah be pleased with him) said: "Learn the Qur'an, for in exchange for reciting one letter of the Qur'an, ten good deeds are written and ten sins are erased. As for me, I do not say that Alif Lam Mim is one letter; rather I say: for Alif there are ten good deeds, for Lam there are ten good deeds, and for Mim there are ten good deeds."