Mahasatipatthana Sutta
v. Dhatumanasika Pabba (Section on Contemplation on Elements)

And again, bhikkhus, a bhikkhu examines and reflects closely upon this very body however it be placed or disposed as composed of (only) primary elements note41 thus: “There exists in this body the earth element, the water element, the fire element, and the air element.”note42

Just as if, bhikkhus, a skillful butcher or his apprentice, having slaughtered a cow and divided it into portions were sitting at the junction of four high roads,note43 just so, a bhikkhu examines and reflects closely upon this body however it be placed or disposed as composed of (only) the primary elements thus: “There exists in this body the earth element, the water element, the fire element and the air element.”

Thus he dwells perceiving again and again the body as just the body in himself…. Thus bhikkhus, this is also a way in which a bhikkhu dwells perceiving again and again the body as just the body.