俱舍論記 28.80

28.80

「初二定中至及四支故」者，說一切有部答。雖初定有三識樂，正在定中無樂根故。非初、二定有身受樂，正在定中無五識故；亦無心受樂，以說有喜故。喜即喜受，無一心中喜、樂二受俱行，故無樂受。不可喜、樂受更互現前，說初靜慮具五支故，第二靜慮具四支故。

"In the first two dhyānas... and four factors" is the answer of the Sarvāstivāda. Although in the first dhyāna there is pleasure associated with three consciousnesses, when one is actually in concentration, there is no pleasure faculty (sukhindriya). It is not that the first and second dhyānas have physical bodily pleasure, because while actually in concentration there are no five [sensory] consciousnesses; nor is there mental pleasure, because joy (prīti) is stated to exist. Joy is joyful sensation (saumanasya); two sensations, joy and pleasure, cannot run concurrently in a single mind, so there is no pleasant sensation. Nor can joyful and pleasant sensations present themselves alternately, because the first dhyāna is said to possess five factors and the second dhyāna is said to possess four factors.