The Related Suttas Collection 22.147

14. Burning Chaff

Observing Impermanence

At Sāvatthī.

“Bhikkhus, when a gentleman has gone forth out of faith, this is what’s in line with the teachings. They should meditate watching, again and again, impermanence in form, feeling, perception, functioning patterns, and consciousness. … They’re freed from suffering, I say.”