General Behavior (Kitab Al-Adab)
43/139. Chapter:
How many times should one say salam when seeking permission to enter
Sunan Abi Dawud
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 (May peace be upon him).
Reference : Sunan Abi Dawud 5184In-book reference : Book 43, Hadith 412English translation : Book 42, Hadith 5165