俱舍論疏 20.102

20.102

論「非經部師至當廣顯示」，述經部計異有部也。經部不同有部計過去業能生當果。經部宗計業現在時業為先故，引相續身中轉變差別種子令當果生。種現在有，業是曾有，果當有也。

The Śāstra says: "It is not that the Sautrāntika masters... will be explained extensively": this states the Sautrāntika position as distinct from the Sarvāstivādins. The Sautrāntikas do not agree with the Sarvāstivādins' claim that past karma can generate a future fruit. The Sautrāntika school maintains that when karma is present, with karma as the antecedent, it induces a modified distinct seed in the continuum of the body, causing the future fruit to arise. The seed exists in the present, karma has once existed, and the fruit is bound to exist.