《汉书·传·卫青霍去病传》
卫青曾经跟着人去到甘泉宫囚犯居室，有个受钳刑的犯人给他相面说： 你是贵人，做官可到封侯。 
青尝从人至甘泉居室，有一钳徒相青曰： 贵人也，官至封侯。 
Wei Qing once followed someone to the prison cell of Ganquangong. A convicted prisoner who was tortured told him: You are a noble person. You can be an official and be crowned as a marquis.