"I had certain times when I used to come to the Messenger of Allah (ﷺ). When I came to him I would ask for permission to enter. If I found him praying he would clear his throat and I would enter, and if I found him free he would give me permission (to enter)."
Reference: Sunan an-Nasa'i 1211 In-book : Book 13, Hadith 33 English translation : Vol. 2, Book 13, Hadith 1212
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