Ibn Mas`ud (Radhiallaho anha) reported:
The Messenger of Allah (Sallallaahu 'alaihi wasallam) said,
"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.''
[At-Tirmidhi]
Riyad-us-Saliheen – Hadith No: 999
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