Attune Magical Weapon( Eberron Campaign Setting, p. 50)
Through your study of magic weapons, you have become adept at eking every advantage out of their enchanted qualities.
Craft Magic Arms and Armor (PH) , caster level 5th,
When you wield a magic weapon, you gain a +1 insight bonus on attack rolls and damage rolls.
You must spend 24 hours with a newly acquired weapon before you can gain this benefi t when wielding it.