It was narrated that Abu Hurairah said:
“The worst of food is food of a wedding feast to which the rich are invited and the poor are not. Whoever does not accept an invitation has disobeyed Allah and His Messenger.' ”
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنِ الزُّهْرِيِّ، عَنْ عَبْدِ الرَّحْمَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ شَرُّ الطَّعَامِ طَعَامُ الْوَلِيمَةِ يُدْعَى لَهَا الأَغْنِيَاءُ وَيُتْرَكُ الْفُقَرَاءُ وَمَنْ لَمْ يُجِبْ فَقَدْ عَصَى اللَّهَ وَرَسُولَهُ ‏.‏
GradeSahih (Darussalam)
English reference : Vol. 3, Book 9, Hadith 1913
Arabic reference : Book 9, Hadith 1988