(74) باب إِجَابَةِ الدَّاعِي فِي الْعُرْسِ وَغَيْرِه
Narrated Nafi`:
`Abdullah bin `Umar said, "Allah's Messenger (ﷺ) said, 'Accept the marriage invitation if you are invited to it.' " Ibn `Umar used to accept the invitation whether to a wedding banquet or to any other party, even when he was fasting.
Reference: Sahih al-Bukhari 5179
In-book reference: Book 67, Hadith 114
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 62, Hadith 108