Sahih Muslim , Book 38, Hadith 51 (In-Book) ⓘ
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 said: It is I. it is I (these words lead me to no conclusion).
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، وَأَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ - وَاللَّفْظُ لأَبِي بَكْرٍ - قَالَ يَحْيَى أَخْبَرَنَا وَقَالَ أَبُو بَكْرٍ، حَدَّثَنَا - وَكِيعٌ، عَنْ شُعْبَةَ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، عَنْ جَابِرِ بْنِ عَبْدِ، اللَّهِ قَالَ اسْتَأْذَنْتُ عَلَى النَّبِيِّ صلى الله عليه وسلم فَقَالَ " مَنْ هَذَا " . فَقُلْتُ أَنَا . فَقَالَ النَّبِيُّ صلى الله عليه وسلم " أَنَا أَنَا " .
also referenced under: Hadith 2155 (Reference) & Book 25, Hadith 5364 (USC-MSA)