1At Sāvatthī. Sitting to one side, the Venerable Radha said to the Blessed One: "Venerable sir, it is said, ‘of an impermanent nature, of an impermanent nature.’ What now, venerable sir, is of an impermanent nature?"

"Form, Radha, is of an impermanent nature.
Feeling is of an impermanent nature. sn.iii.196
Perception is of an impermanent nature.
Volitional formations are of an impermanent nature.
Consciousness is of an impermanent nature.

"Seeing thus, the instructed noble disciple experiences revulsion towards form, revulsion towards feeling, revulsion towards perception, revulsion towards volitional formations, revulsion towards consciousness.

Experiencing revulsion, he becomes dispassionate. Through dispassion his mind is liberated. When it is liberated there comes the knowledge: ‘It's liberated.’ He understands: ‘Destroyed is birth, the holy life has been lived, what had to be done has been done, there is no more for this state of being.’"

1Sāvatthinidānaṁ. Ekamantaṁ nisinno kho āyasmā rādho bhagavantaṁ etadavoca: "‘aniccadhammo, aniccadhammo’ti, bhante, vuccati. Katamo nu kho, bhante, aniccadhammo"ti?

"Rūpaṁ kho, rādha, aniccadhammo, vedanā aniccadhammo, saññā aniccadhammo, saṅkhārā aniccadhammo, viññāṇaṁ aniccadhammo.

Evaṁ passaṁ … pe … nāparaṁ itthattāyāti pajānātī"ti.

Catutthaṁ.