《旧五代史·后晋·列传七》
史圭原担任河南少尹的时候，有个嵩山的方术之士送给史圭石药，并对史圭说 ：服用它可以延年益寿，然而不可中途停废，停废则疾病发作。 
圭前为河南少尹日，有嵩山术士遗圭石药如斗，谓圭曰： 服之可以延寿，然不可中辍，辍则疾作矣。 
When Shi Gui was originally Shaoyin of Henan, a magician from Mount Song gave Shi Gui a stone medicine and said to Shi Gui: "Taking this can increase your years and life, but you cannot stop taking it halfway, if you stop taking it halfway, your illness will flare up."