Question:

The Prophet (saw) is reported to have said, ‘The sins of my nation were presented before me, and I saw no sin to be greater than that of a man who memorized a verse and then forgot it.‘ Is this hadeeth authentic?

Answer:

I do not know of this hadeth; I have not read of it anywhere. Nonetheless, there are two kinds of forgetting:

1) When one forgets because one is distracted or becomes sick: one who forgets for these reasons is not held accountable.

2) When one forgets because one turns away from the Qur’aan and its recitation: such a person will be held accountable because his forgetfulness was a result of his (own) negligence.

[Taken from "Islamic Rulings Regarding The Qur'aan", Pp. 22-23. Quoting from "Fataawa Al-Fawzaan"]

Source: http://theauthenticbase.wordpress.co...ih-al-fawzaan/