Sahih al-Bukhari 6270
Sahih al-Bukhari · Book 79: Asking Permission · "When you are told to make room in the assemblies, make room..."
Narrated Ibn `Umar:
حَدَّثَنَا خَلاَّدُ بْنُ يَحْيَى ، حَدَّثَنَا سُفْيَانُ ، عَنْ عُبَيْدِ اللَّهِ ، عَنْ نَافِعٍ ، عَنِ ابْنِ عُمَرَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ نَهَى أَنْ يُقَامَ الرَّجُلُ مِنْ مَجْلِسِهِ وَيَجْلِسَ فِيهِ آخَرُ، وَلَكِنْ تَفَسَّحُوا وَتَوَسَّعُوا. وَكَانَ ابْنُ عُمَرَ يَكْرَهُ أَنْ يَقُومَ الرَّجُلُ مِنْ مَجْلِسِهِ، ثُمَّ يُجْلِسَ مَكَانَهُ .
The Prophet (ﷺ) forbade that a man should be made to get up from his seat so that another might sit on it, but one should make room and spread out. Ibn `Umar disliked that a man should get up from his seat and then somebody else sit at his place.