Dutiyamaraṇassatisutta
Ekaṁ samayaṁ bhagavā nātike viharati giñjakāvasathe. Tatra kho bhagavā bhikkhū āmantesi …pe… maraṇassati, bhikkhave, bhāvitā bahulīkatā mahapphalā hoti mahānisaṁsā amatogadhā amatapariyosānā.
Mindfulness of Death (2nd)
At one time the Buddha was staying at Ñātika in the brick house. There the Buddha addressed the mendicants: “Mendicants, when mindfulness of death is developed and cultivated it’s very fruitful and beneficial. It has freedom from death as its objective and culmination.