سُنَنُ أَبِي دَاوُدَ
Sunan Abi Dawud 5184
General Behavior (Kitab Al-Adab)
How many times should one say salam when seeking permission to enter
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، عَنْ مَالِكٍ، عَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ، عَنْ غَيْرِ، وَاحِدٍ، مِنْ عُلَمَائِهِمْ فِي هَذَا فَقَالَ عُمَرُ لأَبِي مُوسَى أَمَا إِنِّي لَمْ أَتَّهِمْكَ وَلَكِنْ خَشِيتُ أَنْ يَتَقَوَّلَ النَّاسُ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم .
The tradition mentioned above has also been transmitted by Abu Musa through a different chain of narrators in a similar manner. This version has : ‘Umar said to Abd Musa: I do not blame you, but I am afraid that the people may talk carelessly about the Messenger of Allah (ﷺ).
Sunan Abi Dawud, 5184Sahih in chain (Al-Albani)صحيح الإسناد (الألباني)