Tome of Divinity

Hello, <name>. I know you're busy helping out the people of Dun Morogh, but when you have the time, you should make your way up to Ironforge to speak to one of our most respected ilk: Tiza Battleforge. She's the one the younger paladins go to when it's time they learn more about the Light and what's expected of ya.

You can find her upstairs in the Hall of Mysteries. If you've never been there, it's in the Mystic Ward. Good luck to ya, <name>.