Law Devotion( Complete Champion, p. 61)
The power of law assists you in combat.
Once per day as a swift action, you can summon the power of law to aid you. Upon activating this ability, you immediately gain a +3 sacred (if your deity is good or neutral) or profane (if your deity is evil) bonus on your attack rolls or to your AC until your next action. At the beginning of your next action, you can reallocate the bonus if desired. This effect lasts for 1 minute. The bonus increases to +5 when you attain 10th level, and to +7 when you attain 15th level.
You can select this feat multiple times, gaining one additional daily use each time you take it.
If you have the ability to turn or rebuke undead, you gain one additional daily use of this feat for each three daily turn or rebuke uses you expend.