Moed Katan, Chapter Three, Mishnah Seven
They do not rend [their clothes] or bare [their shoulders], or provide a meal [for the mourners] except for the relatives of the dead.
And they do not provide a meal except on an upright couch.
They do not bring [food] to the house of mourning on an [ornamental] tray, salver, or flat basket, but in [plain] baskets.
And they do not say the mourners benediction during the festival.
But they may stand in a row and comfort [the mourners] and [the mourners] may formally dismiss the community.