Inflict Light Wounds(Player's Handbook v.3.5, p. 244)
Level: Cleric 1, Dread Necromancer 1, Blighter 1, Death Master 1, Paladin of Slaughter 1, Paladin of Tyranny 1, Destruction 1, Nightbringer Initiate 1,
Components: V, S,
Casting Time: 1 standard action
Target: Creature touched
Saving Throw: Will half
Spell Resistance: Yes
When laying your hand upon a creature, you channel negative energy that deals 1d8 points of damage +1 point per caster level (maximum +5).
Since undead are powered by negative energy, this spell cures such a creature of a like amount of damage, rather than harming it.