Zealous Sanction is a 7th level cleric Encounter power that was introduced in the resource Divine Power.
Zealous Sanction
Cleric Attack 7
You name your foe an enemy of your god. Divine power sears it and heals any who strike it.
Ranged 10
Target: One creature
Attack: Wisdom vs. Will
Hit: 2d8 + Wisdom modifier radiant damage. The first time any ally hits the target before the end of your next turn, that ally can spend a healing surge.