Jabir b. Abdullah reported:I came to Allah's Apostle (ﷺ) and called him (with a view to seeking permission). whereupon Allah's Apostle (ﷺ) said: Who is it? I said: It is I. Thereupon he (the Holy Prophet) came out saying: It is I. it is I

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 (ﷺ) said: It is I. it is I (these words lead me to no conclusion)

This hadith has been transmitted on the authority of Shu'ba with a slight variation of wording and that is:The Prophet (ﷺ) uttered these words: It is I. it is I." in the manner as if he disapproved of this