俱舍論疏 8.106

8.106

論「有色有情至故名想一」，釋第四識住也。身一如前。想一謂唯樂受想也。

The verse commentary states: "Beings having form [...] is therefore called 'one perception'." This explains the fourth station of consciousness (vijñānasthiti). "One body" is as described before. "One perception" refers solely to the perception of pleasant feeling.