俱舍論疏 1.122

1.122

論「於此所說有為法中」，自下第二、一頌明有漏五蘊名。於中有三：一標前生起、二舉頌答、三長行釋。此即第一。有為法中一分，故言有為法中。

The treatise says, "Among these conditioned phenomena that have been spoken of", which begins the second section below: one verse explaining the designations of the defiled five skandhas. In this there are three parts: first, marking what came before to introduce what follows; second, presenting the verse as an answer; third, explaining in prose. This is the first part. Because it is a portion of conditioned phenomena, it says "among conditioned phenomena."