俱舍論記 29.15

29.15

「捨即無貪至五蘊為體」者，釋捨無貪。上來剋性出體。若并眷屬，五蘊為體。

"Equanimity is non-greed [...] having the five skandhas as its essence" explains equanimity as non-greed. The above pinpointed its intrinsic nature to define its essence. If taken together with its retinue, it has the five skandhas as its essence.