坐禪三昧經 1.77

1.77

觀有為法出散亦念息入出——無常是名出散。諸有為法現世中出，從過去因緣和合故集、因緣壞故散——如是隨觀，是名出散觀。

When contemplating conditioned dharmas as arising and dispersing, one also is mindful of breathing in and out: impermanence is called arising and dispersing. Conditioned dharmas arise in the present life; having assembled through the conjunction of past causes and conditions, they disperse because causes and conditions disintegrate. Contemplating accordingly in this way is called the contemplation of arising and dispersing.