大乘起信論義記 3.344

3.344

菩薩發是心故，則得少分見於法身。以見法身故，隨其願力能現八種利益眾生。所謂從兜率天退，入胎，住胎，出胎，出家，成道、轉法輪，入於涅槃。然是菩薩未名法身，以其過去無量世來有漏之業未能決斷，隨其所生與微苦相應，亦非業繫，以有大願自在力故。

Because a bodhisattva generates this mind, they attain a partial vision of the dharmakāya. Because of seeing the dharmakāya, according to the power of their vows they are able to manifest eight kinds of [activities] benefiting sentient beings: namely, descending from the Tuṣita heaven, entering the womb, staying in the womb, emerging from the womb, leaving the household life, attaining the path, turning the wheel of the Dharma, and entering into nirvāṇa. However, this bodhisattva is not yet named dharmakāya, because their outflow-tainted karma from immeasurable lifetimes in the past has not yet been decisively severed, and in accordance with where they are born they are conjoined with subtle suffering; yet they are not bound by karma, because of having the sovereign power of great vows.