As an Action, a Cleric may cast Divine Conduit, which has the same effect on the target creature as Cure Wounds. However, the caster must sacrifice their own HP equivalent to 10 times the Spell Level of the Cure Wounds (e.g. 10 HP for Lvl 1, 20 for Lvl 2, etc.). This spell may not target the caster.

Cure Wounds:

A creature you touch regains a number of hit points equal to 1d8 + your spellcasting ability modifier. This spell has no effect on undead or constructs.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the healing increases by 1d8 for each slot level above 1st.