1st-Level Abjuration
Protective magical frost surrounds you. You gain 5 Temporary Hit Points. If a creature hits you with a melee attack roll before the spell ends, the creature takes 5 Cold damage. The spell ends early if you have no Temporary Hit Points.
The Temporary Hit Points and the Cold damage both increase by 5 for each spell slot level above 1.
Player's Handbook (2024), p. 243