Sahih Muslim — Hadith #11088

And having told us [Ibn Abi Umar] had told us [Sufyan] he said; I once heard [Ziyad bin Sa'd] say; I once heard from [Thabit Al A'raj] telling from [Abu Hurairah] that the Prophet sallallaahu 'alaihi wasallam said: "The worst banquet is a banquet at a wedding, that is, people who should come (the poor) are not invited, and people who are reluctant to come (the rich) are actually invited, whoever does not fulfill the invitation, has truly disobeyed Allah and His Messenger