俱舍論頌疏論本 9.53

9.53

有謂正能造，牽當有果業者，因馳求故，積集能牽，當有果業，此位五蘊總名為有，業名為有，有當果故，以業勝故，標以有名。

"Existence refers to that which directly produces / karma that projects the fruit of future existence": due to running about, one accumulates karma capable of projecting the fruit of future existence; the five skandhas of this stage are collectively named existence. Karma is called existence because it has a future fruit; because karma is dominant, it is designated with the name existence.