[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!"
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»