俱舍論疏 28.253

28.253

「論曰至立空空等名」，總釋三名也。緣前空取空相，名空空。緣前無相取無相相，故名無相無相。緣前無願取無願相，名無願無願也。

From "The Śāstra says:" up to "establishes the names 'emptiness-emptiness' and so forth" generally explains the three names. Taking the preceding emptiness as object and grasping the characteristic of emptiness is called emptiness-emptiness. Taking the preceding signlessness as object and grasping the characteristic of signlessness is called signlessness-signlessness. Taking the preceding wishlessness as object and grasping the characteristic of wishlessness is called wishlessness-wishlessness.