Musnad Ahmad 30:3282

Muhammad ibn Abd al-Rahman al-Tafawi narrated to us, he said: Ayyub narrated to us, from al-Zuhri, from Sa’id ibn al-Musayyib, from Abu Hurayrah, who said: "The worst of food is the food of the wedding feast, which the rich are fed, and the poor are prevented from. And whoever does not accept the invitation has disobeyed Allah and His Messenger."