俱舍論疏 6.156

6.156

論「有時二蘊至及彼生得」，二蘊為因共感一果也。色之四相與所相法，色、行別也。

The treatise says: "Sometimes two aggregates [...] and their arising and acquisition." Two aggregates serve as causes to jointly induce one fruit. The four characteristics of form and the phenomena that possess the characteristics are distinct as form (rūpa) and conditioning factors (saṃskāra).