References – SN 22.102: Perception of Impermanence   
Sutta / Saṃyutta Nikāya / SN 22: Khandhasaṃyutta / SN 22.102: Aniccasaññāsutta (1)

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[Session] Readings by Ajahn Karuṇadhammo: [Aggregates]

Sutta: SN 22.102, Khandhasaṃyutta, “Perception of Impermanence.”

Sutta: SN 22.95, Khandhasaṃyutta, “A Lump of Foam.”

Sutta: SN 22.33, Khandhasaṃyutta, “Not Yours (1).”

The Fourth Foundation of Mindfulness [2013], Session 31