Majjhima Nikaya (Coleção dos Discursos Médios) 3:89
SUJATOvedanāsu vedanānupassī, bhikkhave, tasmiṁ samaye bhikkhu viharati ātāpī sampajāno satimā vineyya loke abhijjhādomanassaṁ.
at that time they meditate observing an aspect of feelings—keen, aware, and mindful, rid of covetousness and displeasure for the world.