仁王經疏 2.100

2.100

釋曰：第三引古證今。若依《本記》，斷三界者，謂除六識，名為業諦。斷煩惱者，阿陀那，即第七識。說煩惱淨果報盡者，除阿賴耶，是第八識，說為果淨。如是三淨，名之為佛。自性清淨，名薩云若性。此意說云：一切眾生三種淨者，即名為佛。由此應知，設得佛果，不出三界。

Explanation: Third, citing the ancient to verify the present. If relying on the Original Commentary, "severing the three realms" means eliminating the six consciousnesses, which is called the truth of karma. "Severing afflictions" refers to the ādāna, which is the seventh consciousness. Stating that "afflictions are purified and retribution is exhausted" means eliminating the ālaya, which is the eighth consciousness, spoken of as the purification of the fruit. Purifying these three in this way is named "buddha." Self-nature purity is named the "nature of sarvajña." The intention here is to say: when all sentient beings have these three kinds of purification, they are called buddhas. From this it should be known that even if one attains the fruit of buddhahood, one does not leave the three realms.