《礼记·内则》
既吃就要吃净，不可再有剩余。如果是父亲去世而母亲健在，每天的早饭晚饭，就由长子在旁照料，而母亲吃剩下的，由弟弟和弟媳们来吃，也要同样吃净，不再剩余。美味可口和易于消化的食品，如果父母吃不完，由小孩子们把它吃掉。在父母公婆跟前，他们如果有事召唤，要先用 唯 答应，然后恭敬地回话。
父母在，朝夕恒食，子妇佐馂，既食恒馂，父没母存，冢子御食，群子妇佐馂如初，旨甘柔滑，孺子馂。在父母舅姑之所，有命之，应唯敬对。
When eating, you must finish everything. Nothing can be left over. If your father has passed and your mother is still alive, the eldest son should be present to take care of your mother’s daily breakfast and dinner. The leftovers after your mother eats can be eaten by your younger brothers and sisters-in-law, and they also must finish all of it. If a delicious or easily digestible food cannot be finished by your parents, it should be eaten by the younger children. In the presence of your parents, if they call for you, you must first answer with the word “Yes”, and then respectfully respond.