Anas said, "I used to serve the Prophet, may Allah bless him and grant him peace." He continued, "I used to enter without asking for permission to enter. One day I came and he said, 'My son, there is a new situation. You should not come in unless you have permission.'"
Reference: Al-Adab Al-Mufrad 807 In-book : Book 33, Hadith 54 English translation : Book 33, Hadith 807
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