瑜伽論記 2.184

2.184

常、無常相者，三世共有故共相。若常相者，量云：汝宗五蘊，應不墮三世，許常相故，如無為等。若無常相，量云：汝宗五蘊，非於三世，恒是實有，無常相故，如空花等。

Regarding "Permanent or impermanent characteristics": because they are shared by the three times, they are common characteristics. If they have a permanent characteristic, the syllogism is: Your school's five skandhas should not fall into the three times, because you accept that they have a permanent characteristic, like unconditioned dharmas and the like. If they have an impermanent characteristic, the syllogism is: Your school's five skandhas are not constantly substantially existent across the three times, because they have an impermanent characteristic, like sky-flowers and the like.