Sahih Muslim Book 42, Hadith Number 7146.

Chapter : To state Hadith after Its verification and recording of “Knowledge”.

It was reported that Abu Huraira used to say: Listen to me, inmate of the apartment; listen to me, inmate of the apartment, while ‘Aisha (Allah be pleased with her) had been busy in observing prayer. As she finished prayer, she said to Urwa: Did you hear his words? And this is how Allah’s Messenger (may peace be upon him) used to utter (so distinctly) that if one intended to count (the words uttered) he would be able to do so.