Muwatta Malik, Book 28, Hadith 49 (USC-MSA) ⓘ
Yahya related to me from Malik from Nafi from Abdullah ibn Umar that the Messenger of Allah, may Allah bless him and grant him peace, said, "When you are invited to a wedding feast, you must go to it."
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا دُعِيَ أَحَدُكُمْ إِلَى وَلِيمَةٍ فَلْيَأْتِهَا " .
also referenced under: Book 28, Hadith 1144 (In-Book)