Al-Kāfi - Volume 6 > Preparation of Food for a Ceremony, like Wedding and so forth
Hadith #4

الْحُسَيْنُ بْنُ مُحَمَّدٍ عَنْ مُعَلَّى بْنِ مُحَمَّدٍ بِإِسْنَادٍ ذَكَرَهُ عَنْ أَبِي إِبْرَاهِيمَ ( عليه السلام ) قَالَ نَهَى رَسُولُ اللَّهِ ( صلى الله عليه وآله ) عَنْ طَعَامِ وَلِيمَةٍ يُخَصُّ بِهَا الْأَغْنِيَاءُ وَ يُتْرَكُ الْفُقَرَاءُ .

4. Al-Husayn from Muhammad has narrated from Mu‘alla’ ibn Muhammad from those whom he has mentioned who has said the following: “Abu Ibrahim, ‘Alayhi al-Salam, has said that the Messenger of Allah, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, prohibited feeding during a ceremony, only the rich and not the poor.’”