《太平广记·卷三百二十二·鬼七》
有位道士竺法师，和北中郎王恒之是非常好的朋友。两个人在一起议论生死、罪福、因果报应等等事情，常常弄不清楚。于是两人互相约定：如果谁先死以后必须告诉没死的那一个。
沙门竺法师，会稽人，与北中郎王恒之，周旋甚厚，共论死生罪福报应之事，茫昧难明，因便共要，若有先死，当先报语。
There was a Taoist named Master Zhu who was the dearest of friends with the Northern Zhong Lang, Wang Hengzhi. Together, they would discuss matters of life and death, fortune and misfortune, cause and effect, and the like. Often, they would find themselves at an impasse. The two made a pact that, should either of them die first, they would be sure to inform the other. 