‘Abdullāh ibn Mas‘ūd (may Allah be pleased with him) reported: The Messenger of Allah (may Allah’s peace and blessings be upon him) said:
"Whoever recites a letter from the Book of Allah will be credited with a good deed for it, and a good deed is multiplied tenfold. I am not saying that 'Alif-Lām-Mīm' is one letter, but Alif is a letter, Lām is a letter, and Mīm is a letter."
The Prophet (may Allah's peace and blessings be upon him) informed that any Muslim who recites one letter from the Book of Allah will be credited with a good deed for it, and the reward gets multiplied for him up to tenfold.
To illustrate this, he said: "I am not saying that 'Alif-Lām-Mīm' is one letter, but Alif is a letter, Lām is a letter, and Mīm is a letter." Thus, they are three and equal thirty good deeds.
Lessons
The Hadīth urges us to recite the Qur’an a lot.
For every single letter of every word, the reciter receives a good deed multiplied tenfold.
It shows the vastness of Allah’s mercy and generosity as He multiplies the rewards for His servants, as a favor and bounty from Him.
It demonstrates the superiority of the Qur’an over other speech and that it is recited as a form of worship because it is the speech of Allah Almighty.
Explanation in Arabic
أَخْبرَ النبيُّ صلى الله عليه وسلم أنَّ كلَّ مسلمٍ يقرأ حرفًا من كتاب اللّه فله به حسنة، ويُضاعَفُ له الأجرُ إلى عشَرةِ أمثالِه.
ثم بَيَّنَ ذلك بقوله: (لا أقول "ألم" حرف، ولكن ألف حرف، ولام حرف، وميم حرف): فتكون ثلاثة فيها ثلاثون حسنة.
الحث على الإكثار من تلاوة القرآن.
للقارئ بكل حرف من كل كلمة يتلوها حسنة مضاعفة بعشر أمثالها.
سعة رحمة الله وكرمه حيث ضاعف للعباد الأجر فضلًا منه وكرمًا.
فضل القرآن على غيره من الكلام، والتعبد بتلاوته؛ وذلك بأنه كلام الله تعالى.