Sahih Muslim , Book 16, Hadith 114 (In-Book) ⓘ
Ibn Umar (Allah be pleased withthem) reported Allah's Apostle having said this: When any one of you is invited to a wedding feast, he should accept that.
حَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " إِذَا دُعِيَ أَحَدُكُمْ إِلَى وَلِيمَةِ عُرْسٍ فَلْيُجِبْ " .
also referenced under: Hadith 1429 (Reference) & Book 8, Hadith 3339 (USC-MSA)