俱舍論記 28.176

28.176

「義亦有殊至具三唯捨受」者，答。義亦有殊。謂諸近分為離下染是入初因。中定不然，非離下染、非入初因，是初果故。復有別義。

"In meaning there is also a difference […] possessing all three, only equanimity feeling" is the answer. In meaning there is also a difference: the preliminary stages, being for the purpose of abandoning lower defilement, are the entering causes of the first [dhyāna]. The intermediate concentration is not so; it does not abandon lower defilement and is not the entering cause of the first, because it is the fruit of the first. There are also further meanings.