《太平广记·卷十·神仙十》
后来刘根辞去官职进山学道，在河南的嵩山里住进一个石洞，石洞在悬崖绝壁上，有五千多丈高。
后弃世学道，入嵩高山石室，峥嵘峻绝之上，直下五千余丈。
Later, Liu Gen resigned from his official position and went into the mountains to study the Tao, living in a stone cave in Songshan, Henan Province. The stone cave was on a steep cliff, more than five thousand feet high.