Pariññātasutta
“Cattārome, bhikkhave, satipaṭṭhānā. Katame cattāro? Idha, bhikkhave, bhikkhu kāye kāyānupassī viharati ātāpī sampajāno satimā, vineyya loke abhijjhādomanassaṁ. Tassa kāye kāyānupassino viharato kāyo pariññāto hoti. Kāyassa pariññātattā amataṁ sacchikataṁ hoti.
Complete Understanding
“Mendicants, there are these four kinds of mindfulness meditation. What four? It’s when a mendicant meditates by observing an aspect of the body—keen, aware, and mindful, rid of covetousness and displeasure for the world. As they do so they completely understand the body. When the body is completely understood they realize freedom from death.