‘Abdallah b. ‘Umar reported God’s Messenger as saying, “When one of you is invited to a wedding-feast he must attend it.” In a version by Muslim he said, “He must accept, whether it is a wedding-feast or something of that nature.”
Jabir reported God’s Messenger as saying, “When one of you is invited to a meal he must accept. If he wishes he may eat, but if he wishes he may leave the food alone.”
The Prophet stayed three nights between Khaibar and Medina when he took up cohabitation with Safiya, and I called the Muslims to his wedding-feast which included no bread or meat. He just ordered some cloths to be spread, and dates, dried curd and clarified butter were thrown on them.