كتاب الآداب
38  
The Book of Manners and Etiquette
(8)
Chapter: It Is Disliked For The Person Who Is Seeking Permission To Say "Me" When Asked "Who Is It?"
(8)
باب كَرَاهَةِ قَوْلِ الْمُسْتَأْذِنِ أَنَا ‏إِذَا قِيلَ مَنْ هَذَا ‏‏
Sahih Muslim 2155 a

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.
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ إِدْرِيسَ، عَنْ شُعْبَةَ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ، قَالَ أَتَيْتُ النَّبِيَّ صلى الله عليه وسلم فَدَعَوْتُ فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ مَنْ هَذَا ‏"‏ ‏.‏ قُلْتُ أَنَا ‏.‏ قَالَ فَخَرَجَ وَهُوَ يَقُولُ ‏"‏ أَنَا أَنَا ‏"‏ ‏.‏
Reference : Sahih Muslim 2155a
In-book reference : Book 38, Hadith 50
USC-MSA web (English) reference : Book 25, Hadith 5363
  (deprecated numbering scheme)