The skill you are thinking about is called Holy Succor.
It worked like this, if you healed someone with it. You got healed as well for 50% of the heal. (I believe it scaled off vit)
They also had another amazing move called Divine Veil.
Cure and Cura spells cast on you by other players grant a healing over time effect to all party members within range. (aka regen for those near you)