《史记·三十世家·楚世家》
今天您身为楚相，来攻打魏国，已打败魏军杀死魏将，没有比这再大的功劳了，可是官职爵禄不可能再增加；假使打不胜，您将要殉职丢爵，给楚国造成不好的声誉，这就是画蛇添足。
今君相楚而攻魏，破军杀将，功莫大焉，冠之上不可以加矣。
Today, as the prime minister of Chu, you came to attack Wei, and you have defeated the Wei army and killed Wei Jiang, there is no greater credit than this, but your official position and title cannot be increased; If you fail to win, you will die and lose your title, which will give Chu a bad reputation, which is the case of adding feet to a snake.