Maraṇasati
Maraṇasati or maraṇassati (mindfulness of death, death awareness) is a Buddhist meditation practice of remembering (frequently keeping in mind) that death can strike at any time (AN 6.20), and that we should practice assiduously (appamāda) and with urgency in every moment, even in the time it takes to draw one breath. Not being diligent every moment is called negligence by the Buddha (AN 6.19).