( Player’s Handbook II, p. 92)
You can channel the energy of a touch spell into a weapon, causing the spell to discharge when you strike an opponent.
Base attack bonus +1, caster level 1st,
You can alter a spell with a range of touch to transfer its energy from your hand to a weapon that you hold. The next time you strike an opponent with that weapon, the spell discharges. The target takes the normal damage and effects of a successful attack in addition to the spell’s effect. Once you place a spell into a weapon, you must discharge it within 1 minute, or its energy dissipates harmlessly. You can place a smiting spell on a piece of ammunition or a projectile, such as a sling bullet, an arrow, or a crossbow bolt. In such a case, the spell dissipates if the attack misses. The spell cannot be placed on a bow, crossbow, sling, or similar weapon that uses ammunition. A smiting spell uses up a spell slot one level higher than the spell’s actual level.