The Book on General Behaviour (Kitab Al-Adab)
Muslim :: Book 25 : Hadith 5364
Jabir b. Abdullah reported: I sought permission from Allah's Messenger (may peace be upoh him) to see him. He said: Who is it? I said: It is I. Thereupon Allah's Messenger (may peace be upon him) said: It is I. it is I (these words lead me to no conclusion).