俱舍論疏 6.158

6.158

論「於色界中至及彼生等」，明色界也。色界有二類：一蘊為因，共感一果、一得；二無想定。

The treatise says: "In the form realm, [...] and their arising and so forth." This clarifies the form realm. In the form realm there are two classes: where one aggregate serves as cause, jointly inducing one fruit: one is acquisition; two is the non-conceptual absorption (asaṃjñi-samāpatti).