(16) باب الأَمْرِ بِإِجَابَةِ الدَّاعِي إِلَى دَعْوَةٍ
Abu Haraira (Allah be pleased with him) reported Allah's Apostle (ﷺ) as saying. The worst kind of food is at the wedding feast from which one who comes is turned away, and he who refuses it is invited, and he who did not accept the invitation disobeyed Allah and His Messenger (ﷺ).
Reference: Sahih Muslim 1432 d
In-book reference: Book 16, Hadith 128
USC-MSA web (English) reference(deprecated numbering scheme): Book 8, Hadith 3353