俱舍論疏 24.88

24.88

「論曰至故名身證」，即不還果具八解脫，以身中有滅盡定得。轉名身證，由身證得似涅槃法，故名身證。

"The treatise says... therefore named bodily witness" means that the fruit of non-return possesses the eight liberations (vimokṣa), because within the physical body there is the acquisition of the absorption of cessation (nirodhasamāpatti). It receives the name 'bodily witness' because through the body one witnesses and attains a dharma resembling nirvāṇa, hence it is called 'bodily witness'.