Sahih Muslim 3510
صحيح مسلم#3510Sahihوَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا خَالِدُ بْنُ الْحَارِثِ، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِذَا دُعِيَ أَحَدُكُمْ إِلَى الْوَلِيمَةِ فَلْيُجِبْ " . قَالَ خَالِدٌ فَإِذَا عُبَيْدُ اللَّهِ يُنَزِّلُهُ عَلَى الْعُرْسِ .
Ibn 'Umar (Allah be pleased with them) reported Allah's Apostle (ﷺ) as saying:When any one of you is invited to a feast, he should accept. 'Ubaidallah took this feast to be a wedding feast
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 16:113