uncommon evocation fire good 

Cast [>>] somatic, verbal

Range touch; Targets 1 weapon without an unholy rune that is unattended or wielded by you or a willing ally

Duration 1 minute

The target weapon becomes wreathed in a glowing flame. The weapon deals an additional 1d4 fire and 1 good damage on a successful Strike. In addition, the flame causes the weapon to glow as bright as a torch. You can Dismiss the spell.

LOL, page 101.