Volume 6, Book 61, Number 550:
Narrated Abdullah:
The Prophet said, “It is a bad thing that some of you say, ‘I have forgotten such-and-such verse of
the Qur’an,’ for indeed, he has been caused (by Allah) to forget it. So you must keep on reciting the
Qur’an because it escapes from the hearts of men faster than camel do.”