Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tabarani:8647 – Isḥāq b. Ibrāhīm al-Dabarī > ʿAbd al-Razzāq > Maʿmar > ʿAbd al-Karīm al-Jazarī > Abū ʿUbaydah > Ibn Masʿūd

[Machine] Whoever recites the Quran, for every letter of a verse, he will receive ten rewards. And 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, totaling thirty rewards.  

الطبراني:٨٦٤٧ – حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ الدَّبَرِيُّ أَنَا عَبْدُ الرَّزَّاقِ أَنَا مَعْمَرٌ عَنْ عَبْدِ الْكَرِيمِ الْجَزَرِيِّ عَنْ أَبِي عُبَيْدَةَ عَنِ ابْنِ مَسْعُودٍ قَالَ

مَنْ قَرَأَ الْقُرْآنَ فَلَهُ بِكُلِّ حَرْفِ آيَةٍ عَشْرُ حَسَنَاتٍ وَلَا أَقُولُ الْم عَشْرٌ وَلَكِنْ أَلِفٌ وَلَامٌ وَمِيمٌ ثَلَاثُونَ حَسَنَةً  

See similar narrations below:

Collected by Ṭabarānī
tabarani:8649 – Muḥammad b. ʿAbdūs b. Kāmil > ʿAlī b. al-Jaʿd > Shuʿbah > ʿAṭāʾ b. al-Sāʾib > Abū al-Aḥwaṣ > ʿAbdullāh b. Masʿūd

[Machine] Learn the Quran and recite it, you will be rewarded ten good deeds for every letter. Indeed, I do not say "Alif, Lam, Meem" but I say, "Alif, Lam, Meem".  

الطبراني:٨٦٤٩ – حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدُوسِ بْنِ كَامِلٍ ثنا عَلِيُّ بْنُ الْجَعْدِ ثنا شُعْبَةُ عَنْ عَطَاءِ بْنِ السَّائِبِ عَنْ أَبِي الْأَحْوَصِ عَنْ عَبْدِ اللهِ بْنِ مَسْعُودٍ قَالَ

تَعَلَّمُوا الْقُرْآنَ وَاتْلُوهُ تُؤْجَرُوا بِكُلِّ حَرْفٍ عَشْرُ حَسَنَاتٍ أَمَا إِنِّي لَا أَقُولُ الْم وَلَكِنْ أَقُولُ أَلِفٌ وَلَامٌ وَمِيمٌ