Digha Nikaya (Coleção dos Discursos Longos) 2:11
SUJATOcitte cittānupassī viharati ātāpī sampajāno satimā vineyya loke abhijjhādomanassaṁ,
They meditate observing an aspect of the mind—keen, aware, and mindful, rid of covetousness and displeasure for the world.