《管子·弟子职》
多人空碗按年龄分别先后。周而复始，用长勺就无需跪着送上。这都是添饭的规章。
同嗛以齿，周则有始，柄尺不跪，是谓贰纪。
Many people's empty bowls are arranged in order of age. They repeat this cycle, so there is no need to kneel when delivering the food with a long spoon. These are the rules for serving food.