Sahih Muslim
The Book of Marriage (Kitab Al-Nikah)
Book Number: 008 / Hadith Number: 3353
Abu Haraira (Allah be pleased with him) reported Allah's Apostle (may peace be upon him) as saying. The worst kind of food is at the wedding feast from which one who comes is turned away, and he who refuses it is invited, and he who did not accept the invitation disobeyed Allah and His Messenger (may peace be upon him).