Aegis of Shielding

You protect your ally with a gleaming barrier of invisible force. Until the end of the turn, the target of the triggering attack gains resistance to bludgeoning, piercing, and slashing damage, as well as a +5 bonus to AC, including against the triggering attack.

After the triggering attack is resolved (whether it hits or misses), the creature that made the attack takes 1d4 force damage and has disadvantage on attack rolls against creatures besides you until the end of its next turn.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the range increases to 60 feet, and the force damage increases by 1d4 for each slot level above 3rd.