Blessed Healer is a Life Cleric feature gained at level 6 in D&D 5e. Beginning at 6th level, the healing spells you cast on others heal you as well.
Beginning at 6th level, the healing spells you cast on others heal you as well. When you cast a spell of 1st level or higher that restores hit points to a creature other than you, you regain hit points equal to 2 + the spell's level.