PHB, page 250 SRD
1-level Evocation
A creature of your choice that you can see within range regains hit points equal to 1d4 + 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 1d4 for each slot level above 1st.