Hadith 3736
Chapter 1: What has been reported about accepting invitations - كتاب الأطعمة
حَدَّثَنَا الْقَعْنَبِيُّ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا دُعِيَ أَحَدُكُمْ إِلَى الْوَلِيمَةِ فَلْيَأْتِهَا " .
‘Abd Allah b. ‘Umar reported the Prophet(ﷺ) as sayings:
when one of you is invited for a wedding feast, he must attend it.
Reference : Sunan Abi Dawud 3736
In-book reference : Book 28, Hadith 1