Prophet knocked door three times with greeting for permission..

Hadith 

 

"حَدَّثَنَا عَبْدَةُ، قَالَ حَدَّثَنَا عَبْدُ الصَّمَدِ، قَالَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا ثُمَامَةُ بْنُ عَبْدِ اللَّهِ، عَنْ أَنَسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ كَانَ إِذَا سَلَّمَ سَلَّمَ ثَلاَثًا، وَإِذَا تَكَلَّمَ بِكَلِمَةٍ أَعَادَهَا ثَلاَثًا‏.‏" 

  

Narrated Anas: 

Whenever the Prophet (ﷺ) asked permission to enter, he knocked the door thrice with greeting and whenever he spoke a sentence (said a thing) he used to repeat it thrice. (See Hadith No. 261, Vol. 8). 

Sahih 

Sahih al-Bukhari, 94

In-Book Reference: Book 3, Hadith 36

USC-MSA web (English) reference: Vol. 1, Book 3, Hadith 94 (deprecated numbering scheme) 

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