俱舍論記 24.75

24.75

「論曰至故名身證」者，有滅定得起名得滅定。即不還者，若於身中有滅定得，轉名身證。謂不還者，由此色身而能證得滅盡定，似涅槃法，故名身證。

"The treatise says: [...] is therefore called a bodily witness": when the possession of the absorption of cessation (nirodha-samāpatti) arises, one is called one who has attained the absorption of cessation. Namely, if within the body of a non-returner there is the possession of the absorption of cessation, their name shifts to 'bodily witness'. This means that because a non-returner is able, by means of this material body, to personally witness the absorption of cessation, which is a state resembling nirvāṇa, they are called a bodily witness.