Sahih Muslim Book 004, Hadith Number 1725.

Chapter : Concerning dozing off in prayer, or faltering of one's tongue in the recitation of the Qur'an, or in mentioning of Allah, one should sleep, or stop it till one becomes lively.

'Abdullah is reported to have said: Keep refreshing your knowledge of the sacred books (or always renew your knowledge of these sacred books) and sometimes he would mention the Qur'an for it is more apt to escape from men's minds than animals which are hobbled, and the Messenger of Allah (may peace be upon him) said: None of you should say: I forgot such and such a verse, but he has been made to forget.

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