Sahih al-Bukhari, Volume 7, Book 62, Hadith 106 (USC-MSA) ⓘ
Narrated Abu Huraira: The worst food is that of a wedding banquet to which only the rich are invited while the poor are not invited. And he who refuses an invitation (to a banquet) disobeys Allah and His Apostle.
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنِ ابْنِ شِهَابٍ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، رضى الله عنه أَنَّهُ كَانَ يَقُولُ شَرُّ الطَّعَامِ طَعَامُ الْوَلِيمَةِ يُدْعَى لَهَا الأَغْنِيَاءُ، وَيُتْرَكُ الْفُقَرَاءُ، وَمَنْ تَرَكَ الدَّعْوَةَ فَقَدْ عَصَى اللَّهَ وَرَسُولَهُ صلى الله عليه وسلم.
also referenced under: Book 67, Hadith 112 (In-Book) & Hadith 5177 (DarusSalam)