俱舍論疏 2.45

2.45

On the Śāstra's: "Bound to the formless realm... bound to the formless realm": this is the third part, explaining the formless realm. In the formless realm there are only the last three, because one must be separated from lust for form in order to be born there. "Form" refers to the five faculties and five objects. Because of detachment from lust for form, there are no faculties or objects there. Although one is not detached from lust for mind, because faculties and objects are absent, the five consciousnesses are also absent. For this reason, there are only the last three dhātus, namely the mind, mental consciousness, and dharma dhātus.