Retrieve Spell( Complete Champion, p. 62)
You can channel raw divine energy to recharge a previously cast spell.
ability to turn or rebuke undead, Any two divine feats,
As a standard action, you can expend turn or rebuke undead attempts to recover a spell you have already cast that day. You must spend a number of daily uses equal to 1 + the level of the spell you wish to recover. You can recover only spells within the class that grants your turn or rebuke undead ability. You cannot, for example, use this ability to regain a previously cast wizard spell.