(16) باب الأَمْرِ بِإِجَابَةِ الدَّاعِي إِلَى دَعْوَةٍ
Jabir (Allah be pleased with him) reported that Allah's Messenger (may peace he upon him) said:
When any one of you is invited to a feast, he should accept it. He may eat if he likes, or he may abandon (eating) if he likes. Ibn Mathanni did not make mention of the word" feast".
Reference: Sahih Muslim 1430 a
In-book reference: Book 16, Hadith 121
USC-MSA web (English) reference(deprecated numbering scheme): Book 8, Hadith 3346