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).
Sahih Muslim Book 38, Hadith 51
← Previous Hadith 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.

Sahih Muslim Book 38, Hadith 50 Next Hadith → The Prophet (ﷺ) uttered these words: It is I. it is I." in the manner as if he disapproved of this.

Sahih Muslim Book 38, Hadith 52