俱舍論疏 28.110

28.110

論「非初二定至無五識故」，已下進退推尋無有樂受。樂有二種：一者身樂、二者心樂。身受樂者，五識相應。定中無五識，故無身受樂也。

From the treatise passage: "It is not that the first two absorptions [...] because there are no five consciousnesses": below, investigating through assertion and concession shows that there is no pleasurable feeling. There are two kinds of pleasure: first, bodily pleasure; second, mental pleasure. Bodily pleasurable feeling is associated with the five consciousnesses. In meditative absorption there are no five consciousnesses, hence there is no bodily pleasurable feeling.