وَلِمُسْلِمٍ: «إِذَا دَعَا أَحَدُكُمْ أَخَاهُ، فَلْيُجِبْ; عُرْسًا كَانَ أَوْ نَحْوَهُ»
“When one of you invites his brother, he must respond (i.e. attend), whether it is a wedding or something similar.”
Bulugh al-Maram 1210, Book 8, Marriage, Hadith 88. 1 min read