俱舍論疏 6.165

6.165

論「若感意處至應知亦爾」，感二處也。意與法處，即是四相及得，心所法也。觸法處者，得、四相也。

On the Śāstra's: "If it produces the mind-faculty āyatana [...] one should know it is likewise": this is producing two āyatanas. The mind and the mental āyatanas are precisely the four characteristics, acquisition, and the mental factors. The tangible and mental āyatanas are acquisition and the four characteristics.