Mishkat al-Masabih #671
Prayer
He also reported God’s Messenger as saying, “The rewards of my people were placed before me, even and the sins of my people were placed before me, and I saw no sin greater than that a man should memorise a sura or verse of the Qur’an, then forget it."*
* Cf. Al-Qur’an, 20:126.
Tirmidhi and Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #671 from Mishkat al-Masabih, in the Book of Prayer. Mishkat al-Masabih contains 4,428 hadiths across 25 books.