《史记·三十世家·楚世家》
从皇门进入郑都，郑伯脱去上衣露出胳膊牵着羊迎接庄王说： 我不为上天所保佑，不能侍奉您，您因此发怒，来到我国，这是我的罪过。
入自皇门，郑伯肉袒牵羊以逆，曰： 孤不天，不能事君，君用怀怒，以及敝邑，孤之罪也。
Entering the capital of Zheng from the royal gate, the Earl of Zheng took off his coat, exposed his arm, and held a goat to welcome King Zhuang, saying, "I was not blessed by heaven and could not serve you. You were therefore furious and came to my country. It was my fault."