Basic Rules, pg. 277
Spare the Dying
0-level (Cantrip)
Necromancy
Casting Time 1 Action
Range Touch
Duration Instantaneous
Components V, S
Damage Type: Healing
Saving Throws: None
Description: You touch a living creature that has 0 hit points. The creature becomes stable. This spell has no effect on undead or constructs.
Class(es): Cleric, Artificer