Aniccānupassīsutta

Sāvatthinidānaṁ. “Saddhāpabbajitassa, bhikkhave, kulaputtassa ayamanudhammo hoti— yaṁ rūpe aniccānupassī vihareyya. Vedanāya … saññāya … saṅkhāresu … viññāṇe aniccānupassī vihareyya …pe… ‘parimuccati dukkhasmā’ti vadāmī”ti. Dvādasamaṁ.

At Sāvatthī. “Mendicants, when a gentleman has gone forth out of faith, this is what’s in line with the teaching. They should meditate observing impermanence in form, feeling, perception, choices, and consciousness. … They’re freed from suffering, I say.”