Devoted Inquisitor( Complete Adventurer, p. 107)
Your faithful service to your patron deity involves training and methods that many paladins consider questionable. By using the unconventional methods of rogues and assassins, you have learned to deliver devastating sneak attacks against evil foes.
Smite evil, sneak attack,
When you successfully use your sneak attack ability and your smite evil ability against the same foe in a single attack, you can potentially daze your foe. An opponent affected by both abilities must make a Will saving throw (DC 10 + 1/2 your character level + your Cha modifier) or be dazed for 1 round. In addition, you can multiclass freely between the paladin and rogue classes. You must still remain lawful good in order to retain your paladin abilities and take paladin levels. You still face the normal XP penalties for having multiple classes more than one level apart.