Sunan Ibn Majah #3707 · Etiquette

Sunan Ibn MajahIt was narrated that Abu Ayyub Ansari said
Sunan Ibn Majah · Book 33 · Etiquette
Sunan Ibn Majah · كتاب 33 · كتاب الأدب
"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
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 ‏"‏ ‏.‏
Reference : Sunan Ibn Majah 3707In-book reference : Book 33, Hadith 51