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ahmad:15615 – Ḥasan > Ibn Lahīʿah > Zabbān > Sahl b. Muʿādh from his father

[Machine] From the Messenger of Allah ﷺ that he said: It is the right of the one who enters a gathering to greet those in the gathering, and it is the right of the one who leaves a gathering to greet. So a man stood up while the Messenger of Allah was speaking, but he did not greet. So the Messenger of Allah ﷺ said, "How quickly he has forgotten!"  

أحمد:١٥٦١٥ – حَدَّثَنَا حَسَنٌ حَدَّثَنَا ابْنُ لَهِيعَةَ حَدَّثَنَا زَبَّانُ عَنْ سَهْلِ بْنِ مُعَاذٍ عَنْ أَبِيهِ

عَنْ رَسُولِ اللهِ ﷺ أَنَّهُ قَالَ حَقٌّ عَلَى مَنْ قَامَ عَلَى مَجْلِسٍ أَنْ يُسَلِّمَ عَلَيْهِمْ وَحَقٌّ عَلَى مَنْ قَامَ مِنْ مَجْلِسٍ أَنْ يُسَلِّمَ فَقَامَ رَجُلٌ وَرَسُولُ اللهِ يَتَكَلَّمُ فَلَمْ يُسَلِّمْ فَقَالَ رَسُولُ اللهِ ﷺ مَا أَسْرَعَ مَا نَسِيَ  

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī
tabarani:17606 – al-Miqdām b. Dāwud > Asad b. Mūsá > Ibn Lahīʿah > Zabbān b. Fāyid > Sahl b. Muʿādh b. Anas from his father

[Machine] On the authority of the Messenger of Allah ﷺ who said, "It is the right of the one who enters a gathering to greet those already present, and it is the right of the one who is already present to return the greeting." So, a man stood up and the Messenger of Allah ﷺ was speaking but he did not greet. The Messenger of Allah ﷺ said, "How quickly he has forgotten!"  

الطبراني:١٧٦٠٦ – حَدَّثَنَا الْمِقْدَامُ بْنُ دَاوُدَ ثنا أَسَدُ بْنُ مُوسَى ثنا ابْنُ لَهِيعَةَ ثنا زَبَّانُ بْنُ فَايِدٍ عَنْ سَهْلِ بْنِ مُعَاذِ بْنِ أَنَسٍ عَنْ أَبِيهِ

عَنْ رَسُولِ اللهِ ﷺ قَالَ «حَقٌّ عَلَى مَنْ قَامَ مِنْ مَجْلِسٍ أَنْ يُسَلِّمَ عَلَيْهِمْ وَحَقٌّ عَلَى مَنْ أَتَى مَجْلِسًا أَنْ يُسَلِّمَ» فَقَامَ رَجُلٌ وَرَسُولُ اللهِ ﷺ يَتَكَلَّمُ فَلَمْ يُسَلِّمْ فَقَالَ رَسُولُ اللهِ ﷺ «مَا أَسْرَعَ مَا نَسِيَ»  

suyuti:13538a –
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السيوطي:١٣٥٣٨a –

"حَقٌّ عَلَى مَنْ قَامَ مِنْ مَجْلِسٍ أَنْ يُسَلِّمَ عَلَيْهِمْ، وَحَقٌّ عَلَى مَنْ أتَى مَجْلِسًا أَنْ يُسَلِّمَ".  

[حم] أحمد [طب] الطبرانى في الكبير [هب] البيهقى في شعب الإيمان عن معاذ بن أَنس