(1) باب مَا جَاءَ فِي إِجَابَةِ الدَّعْوَةِ
Ibn 'Umar reported the Messenger of Allah(ﷺ) as saying:
if one of you invites his brother, he should accept(the invitation), whether it is a wedding feast or something of that nature.
Reference: Sunan Abi Dawud 3738
In-book reference: Book 28, Hadith 3
English translation: Book 27, Hadith 3729