The Prophet ﷺ said, "When one of you is invited to a wedding feast, let him attend."
حدثنا يحيى عن مالك عن نافع
عن النبي ﷺ إذا نودي أحدكم إلى وليمة فليأتها
No references are available.
Its isnad is sahih. It is in Muwatta 2:77. Bukhari and Muslim also narrated it, as in Muntaqa 3580.