On the authority of Anas ibn Malik, who said: The Messenger of Allah, peace and blessings be upon him, said: "The rewards of my ummah were shown to me, even the speck of dirt that a man removes from the mosque, and the sins of my ummah were shown to me, and I did not see a sin greater than a surah of the Qur'an or a verse that a man was given and then forgot it."(1)

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(1) Its chain of transmission is weak. Ibn Jurayj — who is 'Abd al-Malik ibn 'Abd al-'Aziz — is a mudallis and narrated it with 'an'anah (using ambiguous "on the authority of" phrasing). Ibn al-Madini said, as found in al-Khatib's "al-Kifayah," p. 538: Ibn Jurayj did not hear from al-Muttalib; he used to take his hadiths from Ibn Abi Yahya on his authority. Al-Daraqutni said, as quoted by Ibn al-Jawzi in "al-'Ilal al-Mutanahiyah" 1/117: He used to narrate them with tadlis from Ibn Maysarah and other weak narrators. And al-Muttalib ibn 'Abd Allah did not hear from Anas, according to Ibn al-Madini and al-Bukhari. There is disagreement over its chain of transmission between 'Ali ibn Abi Rawwad and 'Ali ibn Jurayj, as will follow in the takhrij, as al-Tirmidhi quoted from both of them.

It was also narrated by al-Fakihi in "Akhbar Makkah" 2/129, al-Tirmidhi (3243), Abu Ya'la (4265), Ibn Khuzaymah (1297), al-Bayhaqi in "al-Sunan" 2/440 and in "al-Shu'ab" (1814), al-Khatib in "al-Jami' li-Akhlaq al-Rawi" 1/109, Ibn 'Abd al-Barr in "al-Tamhid" 14/136-137, and al-Baghawi in "Sharh al-Sunnah" 2/364, and Ibn al-Jawzi in "al-'Ilal al-Mutanahiyah" (158), via multiple paths from Ibn Abi Rawwad, with this chain. Ibn 'Abd al-Barr said: This hadith is not one that can be used as evidence due to its weakness.

It was also narrated by al-Tabarani in "al-Awsat" (6489) and in "al-Saghir" (547), Abu al-Shaykh in "Tabaqat al-Muhaddithin bi-Asbahan" 3/475-476, Abu Nu'aym in "Akhbar Asbahan" 2/12, al-Shajari in "Amalihi" 1/104, via the path of Muhammad ibn Yazid al-Adami, and al-Khatib in "al-Jami' li-Akhlaq al-Rawi" 1/109 via the path of Muhammad ibn Ribah, from Ibn Abi Rawwad, from Ibn Jurayj, from al-Zuhri, from Anas. In it there is also the 'an'anah of Ibn Jurayj.

It was also narrated by 'Abd al-Razzaq (5977) from Ibn Jurayj, from a man, from Anas.

And it was narrated by Abu 'Ubayd in "Fada'il al-Qur'an," p. 201, from Hajjaj ibn Muhammad, from Ibn Jurayj, who said: I was told about Anas ibn Malik.