宋高僧傳 19.28

19.28

系曰：按封干先天中遊遨京室，知閭丘、寒山、拾得俱睿宗朝人也，奈何宣師《高僧傳》中……閭丘，武臣也，是唐初人。閭丘序記三人，不言年代，使人悶焉。復賜緋，乃文資也。夫如是，乃有二同姓名閭丘也。又大溈祐公於憲宗朝遇寒山子，指其泐潭，仍逢拾得於國清，知三人是唐季葉時猶存。夫封干也，天台沒而京兆出；寒、拾也，先天在而元和逢。為年壽彌長耶？為隱顯不恒耶？《易》象有之，「小狐汔濟」，其此之謂乎！

The appraisal says: According to the records, Fenggan wandered in the capital during the Xiantian era, so we know that Lüqiu, Hanshan, and Shide were all men of Emperor Ruizong's reign. Why then, in Master Daoxuan's Gaoseng zhuan... Lüqiu was a military official of the early Tang. Lüqiu's preface recording the three men does not state their dates, which causes confusion. Moreover, the bestowal of the purple robe with crimson ribbons is a civil qualification. If this is so, there must have been two men named Lüqiu with identical names. Furthermore, the Venerable Dahui You met Hanshanzi during the reign of Emperor Xianzong, who directed him to Letan, and he also encountered Shide at Guoqing; thus we know that these three men were still living in the late Tang. As for Fenggan, he passed away at Tiantai only to appear in the capital; as for Hanshan and Shide, they were present in Xiantian and yet encountered in Yuanhe. Was their lifespan extraordinarily long, or were their appearances and disappearances beyond the ordinary? In the hexagram images of the Book of Changes, it says: "The little fox has almost crossed"; does it not refer to this!