瑜伽論記 3.73

3.73

非黑非白非異熟業能盡諸業等者，不染污故名非黑，非有漏善故名非白，不招無覆無記果故名無異熟果，能斷前三業故名能盡諸業，則取一切無漏方便無間二道為第四業。對法亦云：非黑非白業能盡諸業者，謂於方便無間道中，諸無漏業是彼諸業斷對治故，不同小論唯說十七無漏思為第四業。

Regarding 'neither black nor white, non-maturation karma that can exhaust karmas', etc.: because it is undefiled, it is called not black; because it is not contaminated wholesome karma, it is called not white; because it does not incur an unobscured-unrecorded fruit, it is called having no maturation fruit; because it can sever the previous three karmas, it is called being able to exhaust karmas. Thus it takes all undefiled expedients and the two paths of the uninterrupted path as the fourth karma. The Abhidharma[-samuccaya] also says: 'Neither black nor white karma that can exhaust karmas refers to the taintless karmas in the expedient and uninterrupted paths, because they are the antidotes that sever those karmas.' This differs from the Hīnayāna treatises, which explain only seventeen taintless volitions as the fourth karma.