俱舍論記 8.5

8.5

「頌曰至令心等相續」者，此即正辨。初頌明欲界，第二頌明色界，第三頌明無色界，隨次不同答前兩問。

Regarding the passage from "The verse says..." up to "...cause the mind and so forth to continue in unbroken succession": this directly explains [the subject]. The first verse explains the desire realm (kāmadhātu); the second verse explains the form realm (rūpadhātu); the third verse explains the formless realm (ārūpyadhātu). Following this sequence of differences, they answer the previous two questions.