Hadith: The worst food is the food of a wedding banquet to which the rich are invited while the poor are left out. Anyone who does not answer the invitation has disobeyed Allah and His Messenger (may Allah's peace and blessings be upon him)

عن أبي هريرة رضي الله عنه أنه كان يقول: «شر الطعامِ طعامُ الوليمة، يُدعى لها الأغنياء ويُترك الفقراء، ومن تَرك الدعوة فقد عصى الله ورسوله صلى الله عليه وسلم ».
[صحيح] - [متفق عليه، ورواه مسلم مرفوعًا أيضًا إلى النبي -صلى الله عليه وسلم]

Abu Hurayrah (may Allah be pleased with him) used to say: "The worst food is the food of a wedding banquet to which the rich are invited while the poor are left out. Anyone who does not answer the invitation has disobeyed Allah and His Messenger (may Allah's peace and blessings be upon him)."
Sahih/Authentic. - [Al-Bukhari and Muslim]

Explanation

This reported citation from Abu Hurayrah (may Allah be pleased with him), which could be treated as a Marfū‘ report, corresponds with a Hadīth in which the Prophet (may Allah's peace and blessings be upon him) said that the worst food is the food of a wedding banquet to which only rich people are invited, whereas the poor are left out and despised. Since the rich are invited by way of ostentation and for seeking fame and good repute, the food, therefore, becomes the worst food. If the poor are invited along with the rich, this description is inapplicable. In any case, it is recommended to hold a banquet in appreciation of the divine blessing of marriage. Finally, anyone who does not answer an invitation to a wedding banquet without an excuse disobeys Allah and His Messenger (may Allah's peace and blessings be upon him). The Prophet's instruction should be complied with, due to the interests involved.