《左传·昭公·昭公九年》
主持饮食的官员屠蒯快步走进，请求帮着斟酒，晋平公答应了，屠蒯就斟酒给乐工喝，说： 你作为国君的耳朵，职责是让它聪敏。
膳宰屠蒯趋入，请佐公使尊。许之。而遂酌以饮工，曰： 女为君耳，将司聪也。
Tu Kuai, the official in charge of food and drinks, walked in quickly, requested to pour wine, Duke Ping of Jin agreed, Tu Kuai then poured wine for the musicians to drink, said: You are the ears of the sovereign, the duty is to make it hear clearly.