“”Whoever recites a letter from the Book of Allah, he will be credited with a good deed, and a good deed gets a ten-fold reward. I do not say that Alif-Lam-Mim is one letter, but Alif is a letter, Lam is a letter and Mim is a letter.”
[Sunnan At-Tirmidhi and Al-Dareemi – Classed as Sahih by Sh Albani] ”