俱舍論疏 6.181

6.181

論「又此無為至此為因故」，此難無為合有果也。凡立因名對其果稱，無為是因，應名有果。

On the Śāstra's: "Furthermore, this unconditioned [...] because this is a cause": this raises the objection that the unconditioned should have a fruit. In general, establishing the name "cause" is stated in opposition to its "fruit"; if the unconditioned is a cause, it should be said to have a fruit.