俱舍論疏 23.71

23.71

論「此四善根至除北俱盧」，第六明依身別。所以善根唯依九處，《正理》釋云「唯依欲九身，容入離生故。」

The treatise says: "These four wholesome roots ... with the exception of Uttarakuru." The sixth [section] clarifies the distinction of personal supports. As to why the wholesome roots only rely on nine locations, the Nyāyānusāra explains: "It is only based on the nine bodies of the desire realm that entering the realization of certainty is possible."