《易传·象传上·噬嗑》
 足戴脚镣，断掉了脚趾头 ，受到警戒，不至于旧罪重犯。 施刑伤及犯人的皮肤。
贞厉无咎，得当也。何校灭耳，聪不明也。
Wearing fetters on the feet and having the toes cut off is a warning not to commit old crimes again. Executing a criminal injures the skin.