Seeking Permission to Enter

It was narrated from Abu Saeed Khudri that Abu Musa asked permission to enter upon 'Umar three times, and he did not give him permission, so he went away.'Umar sent word to him saying:
"Why did you go back?" He said: "I asked permission to enter three times, as the Messenger of Allahﷺ 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."

حَدَّثَنَا أَبُو بَكْرٍ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، أَنْبَأَنَا دَاوُدُ بْنُ أَبِي هِنْدٍ، عَنْ أَبِي نَضْرَةَ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، 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 .

It was narrated that Abu Ayyub Ansari said:
"We said: 'O Messenger of Allahﷺ, (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."

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدُ الرَّحِيمِ بْنُ سُلَيْمَانَ، عَنْ وَاصِلِ بْنِ السَّائِبِ، عَنْ أَبِي سَوْرَةَ، عَنْ أَبِي أَيُّوبَ الأَنْصَارِيِّ، قَالَ قُلْنَا يَا رَسُولَ اللَّهِ هَذَا السَّلاَمُ فَمَا الاِسْتِئْنَاسُ قَالَ " يَتَكَلَّمُ الرَّجُلُ تَسْبِيحَةً وَتَكْبِيرَةً وَتَحْمِيدَةً وَيَتَنَحْنَحُ وَيُؤْذِنُ أَهْلَ الْبَيْتِ " .

It was narrated that Ali said:
"I had two times of visiting the Messenger of Allahﷺ, 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)."

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو بَكْرِ بْنُ عَيَّاشٍ، عَنْ مُغِيرَةَ، عَنِ الْحَارِثِ، عَنْ عَبْدِ اللَّهِ بْنِ نُجَىٍّ، عَنْ عَلِيٍّ، قَالَ كَانَ لِي مِنْ رَسُولِ اللَّهِ ﷺ مُدْخَلاَنِ مُدْخَلٌ بِاللَّيْلِ وَمُدْخَلٌ بِالنَّهَارِ فَكُنْتُ إِذَا أَتَيْتُهُ وَهُوَ يُصَلِّي يَتَنَحْنَحُ لِي .