《国语·晋语·曹共公不礼重耳而观其》
重耳一行自卫国经过曹国，曹共公也不以礼相待，听说重耳的肋骨生得连成一片，因此就很想看看是什么样子，便将重耳等安排在旅舍里，打听到重耳准备洗澡，张了很薄的帐幕偷偷观看。
自卫过曹，曹共公亦不礼焉，闻其骿肋，欲观其状，止其舍，谍其将浴，设微薄而观之。
Chong'er and his group passed through Cao State from Wei State, and the Duke of Cao did not treat them with courtesy. Hearing that Chong'er had ribs that were connected, he wanted to see what they looked like, so he arranged for Chong'er and the others to stay in a guest house, and waited for Chong'er to take a bath, and set up a thin screen to peek at him.