Sahih Bukhari
Virtues and Merits of the Prophet (pbuh) and his Companions
Volume: 004 / Book Number: 056 / Hadith Number: 768
Narrated 'Aisha:
The Prophet used to talk so clearly that if somebody wanted to count the number of his words, he could do so. Narrated Urwa bin Az-Zubair: 'Aisha said (to me), "Don't you wonder at Abu so-and-so who came and sat by my dwelling and started relating the traditions of Allah's Apostle intending to let me hear that, while I was performing an optional prayer. He left before I finished my optional prayer. Had I found him still there. I would have said to him, 'Allah's Apostle never talked so quickly and vaguely as you do.' "