大般涅槃經疏 10.26

10.26

次從「善男子我涅槃後」去，合譬也。但合二，不合時。此初合和同。以方便力，合上我捨家法也。與破戒等同其事業者，合上來作王師。《釋論》明四種僧：破戒僧名同雜僧，應是畜不淨僧，有差僧應是假名僧。從「爾時菩薩」下，二合紏治破戒也。八不淨者，謂畜金銀、奴婢、牛羊、倉庫、販賣、耕種、手自作食、不受而啖，污道污威儀，損妨處多，故名不淨。

Next, from "Good sons, after my nirvāṇa" onward is the application of the metaphor. It only applies two, not applying the time. This first applies harmonizing and conforming. "By expedient power" matches "I abandoned household rules" above. "Engaging in the same endeavors as the precept-breakers" matches "becoming the king's teacher" above. The Mahāprajñāpāramitā-upadeśa clarifies four kinds of Saṃgha: a precept-breaking Saṃgha is called a Saṃgha of mixed affiliation, which must refer to a Saṃgha that accumulates impure things; an irregular Saṃgha must refer to a nominal Saṃgha. From "At that time the bodhisattva" below is the second, applying the investigation and rectifying of precept-breakers. The eight impure things refer to keeping gold and silver, male and female slaves, cattle and sheep, storehouses, trading, farming, cooking food with one's own hands, and eating without receiving—these defile the path, defile dignified comportment, and cause hindrance in many ways, hence they are called impure.