俱舍論疏 24.91

24.91

論「理實應言至身寂靜故」，論主正前釋。理實應言：彼不還人從滅定起，初起之時得先未得，唯有識心而身寂靜，便作是思惟：此滅盡定最為寂靜，極似涅槃。如是思慧及身證得身之寂靜，故名身證。此是由起得證身寂靜，及智現前證得身寂靜故，故名身證。

The passage of the treatise starting with "In principle, it should actually be said... because the body is tranquil" is the treatise master's correction of the former explanation. In principle, it should actually be said: When that non-returner emerges from the absorption of cessation, at the moment of first emergence, having obtained what was previously unobtained, there is only a mind of consciousness while the body is tranquil; they then reflect: 'This absorption of cessation is the most tranquil, extremely resembling nirvāṇa.' Such reflective wisdom and the body witnessing the tranquility of the body are why they are called a bodily witness. This is because by emerging one attains witnessing the tranquility of the body, and because knowledge being present witnesses and attains the tranquility of the body; therefore they are called a bodily witness.