《宋史·列传·卷一百五十》
光宗从东宫来拜见皇上，看见留正，便对左右人说： 仪表如此整洁，这个人可用。 于是向皇上请求，留正于是兼太子左谕德。
光宗自东宫朝，顾见正，谓左右曰： 修整如此，其人可知。 乃请于上，兼太子左谕德。
Guangzong came to visit the emperor from the East Palace and saw Liu Zheng. He said to the people around him: So neat and tidy, this man can be used. So he asked the emperor, so Liu Zheng also served as the left Yu De of the crown prince.