Source: Player's Handbook

Level 1 Abjuration (Bard, Cleric, Druid)

Casting Time: Bonus Action
Range: 60 feet
Components: V
Duration: Instantaneous

A creature of your choice that you can see within range regains Hit Points equal to 2d4 plus your spellcasting ability modifier.

Using a Higher-Level Spell Slot. The healing increases by 2d4 for each spell slot level above 1.