Magic Weapon

(Player's Handbook v.3.5, page 251, DnD 3.5)

Transmutation

Level: ; Cleric 1; Paladin 1; Sorcerer/Wizard 1; Disciple of Thrym 1; Hunter of the Dead 1; Knight of the Weave 1; Knight of the Chalice 1; Duskblade 1; Wu Jen 1; Sha'ir 1; Death Master 1; , War 1, ; , Dwarf 1, ; , Metal 1, ; , Revered Ancestor 1
Components: V, S
Casting Time: 1 standard action
Range: Touch
Target: Weapon touched
Duration: 1 min./level
Saving Throw: Will negates (harmless, object)
Spell Resistance: Yes (harmless, object)

Magic weapon gives a weapon a +1 enhancement bonus on attack and damage rolls. (An enhancement bonus does not stack with a masterwork weapon's +1 bonus on attack rolls).

You can't cast this spell on a natural weapon, such as an unarmed strike (instead, see magic fang). A monk's unarmed strike is considered a weapon, and thus it can be enhanced by this spell.