[280] And again, bhikkhus, as though a bhikkhu were to see a corpse discarded in a charnel ground (sivathikā), being devoured by crows, or being devoured by hawks, or being devoured by vultures, or being devoured by dogs, or being devoured by jackals, or being devoured by various kinds of small creatures — he compares this very body with it: 'This body too is of the same nature; it will become thus; it has not gone beyond this.'
Thus he abides contemplating the body in the body (kāyānupassanā) internally, or he abides contemplating the body in the body externally, or he abides contemplating the body in the body both internally and externally. He abides contemplating the nature of origin (samudaya) in the body, or he abides contemplating the nature of vanishing in the body, or he abides contemplating the nature of both origin and vanishing in the body. Or else his mindfulness (sati) that 'there is a body' is established, just to the extent necessary for bare knowledge (ñāṇa) and bare mindfulness; and he abides independent, not clinging to anything in the world. Thus too, bhikkhus, a bhikkhu abides contemplating the body in the body.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.