《资治通鉴·魏纪·魏纪二》
一天，文帝和曹睿父子二人射猎，见到一只母鹿带着一只小鹿，文帝亲手射死了母鹿，要曹睿射那只小鹿，曹睿哭着说： 陛下已经杀了母亲，我不忍心再杀她的儿子。 
帝与睿猎，见子母鹿，帝亲射杀其母，命睿射其子。睿泣曰： 陛下已杀其母，臣不忍复杀其子。 
One day, Emperor Wen and his son Cao Rui went hunting. They saw a doe with a fawn. Emperor Wen shot the doe himself and asked Cao Rui to shoot the fawn. Cao Rui cried and said: Your Majesty has killed its mother, and I can't bear to kill it. 