瑜伽論記 6.507

6.507

一切麁重，悉皆息滅，隨得觸證所依清淨等者，此解四清淨，一身淨，此中號所依，二所緣，三心，四智見清淨。

Regarding "all crudities are extinguished, and accordingly one attains and realizes the purity of the basis," etc.: this explains four purities: first, the purity of the body, which here is named the basis; second, [the purity] of the focal object; third, [the purity] of the mind; fourth, the purity of knowledge and vision.