Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:1407a –
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السيوطي:١٤٠٧a –

"إِذَا انتهى أحدُكم إلى المجلسِ فإنْ وُسِّعَ لَهُ فلْيجلسْ وَإلَّا فلينظرْ إلى أوسِع مَكانٍ يَراهُ فليجلسْ فِيه" .  

البغوي، [طب] الطبرانى في الكبير [هب] البيهقى في شعب الإيمان وابن عساكر عن مصعب بن شيبة بن عثمان عن أبيه

See similar narrations below:

Collected by Ṭabarānī
tabarani:7197 – Muḥammad b. Yazdād al-Tūzī > Muḥammad b. Sulaymān Lūwayn > Sufyān b. ʿUyaynah > ʿAbdullāh b. Zurārah > Muṣʿab b. Shaybah from his father

[Machine] The Messenger of Allah ﷺ said, "When one of you arrives at a gathering, if there is space for him, let him sit, otherwise let him look for a wider place and then sit."  

الطبراني:٧١٩٧ – حَدَّثَنَا مُحَمَّدُ بْنُ يَزْدَادَ التُّوزِيُّ ثنا مُحَمَّدُ بْنُ سُلَيْمَانَ لُوَيْنُ ثنا سُفْيَانُ بْنُ عُيَيْنَةَ عَنْ عَبْدِ اللهِ بْنِ زُرَارَةَ عَنْ مُصْعَبِ بْنِ شَيْبَةَ عَنْ أَبِيهِ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «إِذَا انْتَهَى أَحَدُكُمْ إِلَى الْمَجْلِسِ فَإِنْ وُسِّعَ لَهُ فَلْيَجْلِسْ وَإِلَّا فَلْيَنْظُرْ إِلَى أَوْسَعِ مَكَانٍ يَرَى فَلْيَجْلِسْ»