瑜伽論記 4.236

4.236

既生彼已若起愛味即便退沒者，非上地中定可有退，由多愛味損減壽命名便退沒，此退生也。此地五門廣分別中，上已三段解四門訖。

Regarding "Having been born there, if one gives rise to relish, one immediately falls away and perishes": it is not that meditation in a higher level can be fallen away from; rather, due to extensive relishing, one's lifespan is diminished, and one is immediately said to fall away and perish—this is a falling away from rebirth. Within the extensive distinction of the five gates of this stage, the three preceding sections have completed the explanation of the four gates.