Compiled by Imam Yahya ibn Sharaf al-Nawawi
وعن جابر رضي الله عنه قال: أتيت النبي صلى الله عليه وسلم فدققت الباب، فقال "من ذا؟" فقلت: أنا، فقال: "أنا أنا؟!" كـأنه كرهها ((متفق عليه)).
I went to the Prophet (ﷺ) and knocked at the door (to seek permission). He asked, "Who is there?" I said: "I". He repeated, " I, I?!" as if he disliked it.[Al-Bukhari and Muslim].