Hadith
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
Sahih · Al-Albani
Sunan Abi Dawud 3736 ·Book 28, Hadith 1·Also available on sunnah.com·