Sahih Muslim
The Book on General Behaviour (Kitab Al-Adab)
Book Number: 025 / Hadith Number: 5365
This hadith has been transmitted on the authority of Shu'ba with a slight variation of wording and that is: The Holy Prophet (may peace be upon him) uttered these words: It is I. it is I." in the manner as if he disapproved of this.