(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 invites his brother, he (the latter) should accept his wedding feast, or any other like it.
Reference: Sahih Muslim 1429 e
In-book reference: Book 16, Hadith 116
USC-MSA web (English) reference(deprecated numbering scheme): Book 8, Hadith 3341