Riyad as-SalihinChapter 4Hadith 145
Full Sharh — Riyad as-Salihin 145
عن ابن عمر رضى الله عنهما قال: قال رسول الله صلى الله عليه وسلم: "لا يقمن أحدكم من مجلسه ثم يجلس فيه، ولكن توسعوا وتفسحوا" وكان ابن عمر إذا قام له رجل من مجلسه لم يجلس فيه. ((متفق عليه)).
English Translation
Ibn 'Umar (May Allah be pleased with them) reported:: Messenger of Allah (ﷺ) said, "Do not ask someone to give up his seat in order to take it, but make accommodation wide and sit at ease." It was Ibn 'Umar's habit that if a person left his seat for him, he would not take it. .
Source
Riyad as-Salihin(رياض الصالحين)
The Book of the Etiquette of Sleeping, Lying and Sitting etc
Hadith Number
145