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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.' ”
Source: sunnah.com
Other translations
Arabic
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 .
sunnah.com