宋高僧傳 2.43

2.43

系曰：道家尸解，說有多端。或隱真形而存假質，矧以登地大士、漏盡羅漢？或此在他亡，或分身易態，皆以之為遊戲耳，以之為利物焉。其佛陀波利出沒無恒，變化何極，出金剛窟接法照師，蓋與之有緣，闖然而現。故杜多迦葉久隱諸峯，晉法顯往遊靈鷲，見于山下焉。

Appraisal: Daoist deliverance from the corpse is explained in many ways, sometimes hiding the true form while leaving the false vessel behind. How much more so for Great Beings who have attained the bhūmis, or arhats whose outflows are exhausted? Whether existing here while dying elsewhere, or dividing their bodies and altering their forms, all of this is merely their sport, used to benefit beings. Buddhapāli's appearances and disappearances were without fixed course—how could his transformations have an end? That he emerged from the Vajra Cavern to guide Master Fazhao was simply because there was a karmic affinity between them, and so he suddenly manifested. Thus Dhūta Kāśyapa long concealed himself among the peaks, and when Faxian of the Jin traveled to Vulture Peak, he saw him beneath the mountain.