Reading a letter of the Qur'an: a good deed counted ten

قراءة حرف من القرآن: حسنة بعشر أمثالها

Whoever reads a letter of the Book of God has a good deed for it, and the good deed counts ten; the report then fixes the unit of counting: the opening of al-Baqara is not one letter, for alif is a letter, lam a letter and mim a letter, in Ibn Mas'ud's narration in al-Tirmidhi, who notes that some transmitters raise it to the Prophet ﷺ and others stop it at Ibn Mas'ud Jami' al-Tirmidhi 2910 — the good deed multiplied tenfold and beyond. It is the clearest text that names its unit of account and gives a worked example.