《礼记·郊特牲》
成亲的当晚，在新房里，夫妇同吃一个碗里的菜，其含义是夫妇平等，尊卑相同。
共牢而食，同尊卑也。
On the wedding night, in the bridal chamber, the husband and wife eat vegetables from the same bowl, the meaning of this is that the husband and wife are equal, and both are equally noble.