(16) باب الأَمْرِ بِإِجَابَةِ الدَّاعِي إِلَى دَعْوَةٍ
Ibn 'Umar (Allah be pleased with them) reported Allah's Apostle (ﷺ) as saying:
When any one of you is invited to a feast, he should accept. 'Ubaidallah took this feast to be a wedding feast.
Reference: Sahih Muslim 1429 b
In-book reference: Book 16, Hadith 113
USC-MSA web (English) reference(deprecated numbering scheme): Book 8, Hadith 3338