金光明經文句記 4.301

4.301

二、「行識」下，法空境。例應有三者，行即空假中，乃至老死即空假中，佛言巧略，比前可知故。

Second, from "volitional formations, consciousness" onward, the object of the emptiness of phenomena. That "by analogy there should be three" means that volitional formations are identical to emptiness, provisionality, and the middle, up to old age and death being identical to emptiness, provisionality, and the middle; the Buddha's words are skillfully brief, since by comparison with the preceding it can be understood.