"Why did you go back?" He said: "I asked permission to enter three times, as the Messenger of Allah ﷺ enjoined upon us, then if we are given permission we should enter, otherwise we should go back." He said: "You should bring me proof of that, or else!" Then he came to a gathering of his people and asked them to swear by Allah concerning that, and they did so, so he let him go."  

أَنَّ أَبَا مُوسَى اسْتَأْذَنَ عَلَى عُمَرَ ثَلاَثًا فَلَمْ يُؤْذَنْ لَهُ فَانْصَرَفَ فَأَرْسَلَ إِلَيْهِ عُمَرُ مَا رَدَّكَ قَالَ اسْتَأْذَنْتُ الاِسْتِئْذَانَ الَّذِي أَمَرَنَا بِهِ رَسُولُ اللَّهِ ﷺ ثَلاَثًا فَإِنْ أُذِنَ لَنَا دَخَلْنَا وَإِنْ لَمْ يُؤْذَنْ لَنَا رَجَعْنَا قَالَ فَقَالَ لَتَأْتِيَنِّي عَلَى هَذَا بِبَيِّنَةٍ أَوْ لأَفْعَلَنَّ فَأَتَى مَجْلِسَ قَوْمِهِ فَنَاشَدَهُمْ فَشَهِدُوا لَهُ فَخَلَّى سَبِيلَهُ  

"We said: 'O Messenger of Allah ﷺ, (we know) this (greeting of) Salam, but what does seeking permission to enter mean?' He said: 'It means a man saying SubhanAllah, and Allahu Akbar and Al Hamdulillah, and clearing his throat, announcing his arrival to the people in the house."  

قُلْنَا يَا رَسُولَ اللَّهِ هَذَا السَّلاَمُ فَمَا الاِسْتِئْنَاسُ قَالَ يَتَكَلَّمُ الرَّجُلُ تَسْبِيحَةً وَتَكْبِيرَةً وَتَحْمِيدَةً وَيَتَنَحْنَحُ وَيُؤْذِنُ أَهْلَ الْبَيْتِ  

"I had two times of visiting the Messenger of Allah ﷺ, at night and during the day. If I came to him when he was praying, he would clear his throat (to let me know he was praying)."  

كَانَ لِي مِنْ رَسُولِ اللَّهِ ﷺ مُدْخَلاَنِ مُدْخَلٌ بِاللَّيْلِ وَمُدْخَلٌ بِالنَّهَارِ فَكُنْتُ إِذَا أَتَيْتُهُ وَهُوَ يُصَلِّي يَتَنَحْنَحُ لِي  

"I asked the Prophet ﷺ for permission to enter, and he said: 'Who is that?' I said: 'Me'. The Prophet ﷺ said " Me, me?!"  

اسْتَأْذَنْتُ عَلَى النَّبِيِّ ﷺ فَقَالَ مَنْ هَذَا فَقُلْتُ أَنَا فَقَالَ النَّبِيُّ ﷺ أَنَا أَنَا