Cure Light Wounds(Player's Handbook v.3.5, p. 215)
Level: Bard 1, Urban Druid 1, Nentyar Hunter 1, Knight of the Weave 1, Hunter of the Dead 1, Healer 1, Adept 1, Paladin 1, Druid 1, Cleric 1, Savant 1 (Divine), Ranger 2, Healing 1,
Components: V, S,
Casting Time: 1 standard action
Target: Creature touched
Saving Throw: Will half (harmless); see text
Spell Resistance: Yes (harmless); see text
When laying your hand upon a living creature, you channel positive energy that cures 1d8 points of damage +1 point per caster level (maximum +5).
Since undead are powered by negative energy, this spell deals damage to them instead of curing their wounds. An undead creature can apply spell resistance, and can attempt a Will save to take half damage.