The worst of food is the food of a wedding feast to which the rich are invited and the poor are left out. Whoever does not accept the invitation has disobeyed Allah and His Messenger.
حدثنا علي بن محمد حدثنا سفيان بن عيينة عن الزهري عن عبد الرحمن الأعرج
شر الطعام طعام الوليمة يدعى لها الأغنياء ويترك الفقراء ومن لم يجب فقد عصى الله ورسوله
Bukhari narrated it in the Book of Marriage, chapter "Whoever declines an invitation has disobeyed Allah and His Messenger," hadith no. 5177, from the hadith of Zuhri, through the same chain. Muslim also narrated it in the Book of Marriage, chapter "The Command to Accept an Invitation to a Feast," hadith no. 1432, from the hadith of Sufyan, through the same chain.