俱舍論記 9.206

9.206

「依此便生樂等三受」者，出受支體。依此觸故便生苦、樂、捨三受。

"Relying upon this, the three feelings of pleasure and so on immediately arise": this identifies the substantial nature of the limb of feeling. Relying upon this contact, the three feelings of suffering, pleasure, and equanimity immediately arise.