Suddhasutta

Sāvatthinidānaṁ. “Cattārome, bhikkhave, satipaṭṭhānā. Katame cattāro? Idha, bhikkhave, bhikkhu kāye kāyānupassī viharati ātāpī sampajāno satimā, vineyya loke abhijjhādomanassaṁ; vedanāsu …pe… citte …pe… dhammesu dhammānupassī viharati ātāpī sampajāno satimā, vineyya loke abhijjhādomanassaṁ. Ime kho, bhikkhave, cattāro satipaṭṭhānā”ti. Catutthaṁ.

At Sāvatthī. “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. They meditate observing an aspect of feelings … mind … principles—keen, aware, and mindful, rid of covetousness and displeasure for the world. These are the four kinds of mindfulness meditation.”