增壹阿含經 12.1.p8

12.1.p8

“Furthermore, a monk contemplates this body by discerning its elements: ‘This body has four elements.’ Like a butcher or a butcher’s apprentice cutting up a cow, he examines and sees it himself: ‘This is a leg, the heart, a joint, and the head.’ In this way, that monk discerns these elements when he examines this body: ‘The body has the earth … water … fire … air element.’ In this way, a monk contemplates the body and enjoys himself.