俱舍論疏 7.151

7.151

論「色界染心至亦由退得」，第二明色界染心得六也。從無色沒生色界時，得欲化心，得色界中無覆無記及善、染心。染心亦由退得，餘心唯由界還。

The treatise says: "A defiled mind of the form realm... is also acquired through falling away." This second part explains that a defiled mind of the form realm acquires six [minds]. When dying in the formless realm and being born into the form realm, one acquires the desire-realm mind of magical transformation, and in the form realm acquires the non-defiled indeterminate, the good, and the defiled minds. The defiled mind is also acquired through falling away; the remaining minds are acquired only through returning from a realm.