三彌勒經疏 1.239

1.239

經曰「爾時人眾見」以下，第八辨今利人。《成佛經》云「時迦葉即踊身虛空作十八變，承佛神力，以梵音說釋迦佛十二部經，八十億人得阿羅漢。空而下，說有為無常，辭佛而退，身出水火入涅槃。」是即初也。

From the sūtra passage stating, "At that time the multitude of people saw," onward is the eighth, explaining his benefiting people in the present. The Attainment of Buddhahood Sūtra says: "Then Kāśyapa leapt into the air and performed eighteen transformations. Relying on the Buddha's supernatural power, in a brahma voice he preached Śākyamuni Buddha's twelve divisions of scripture, and eighty billion people attained arhatship. Descending from the sky, he spoke on conditioned phenomena being impermanent, took leave of the Buddha and withdrew, and with fire and water issuing from his body entered nirvāṇa." This is the first.