Sermon Help Time

So, I'm thinking of a passage, but I can't remember it.  I'd like to use it as my text when I preach on Sunday, but to do that, I need to remember it.  So, engaging all of your brains in addition to mine, maybe we'll come up with it.
Once upon a time there was a king. I think he was one of the good kings, perhaps even before the divided kingdom.  Anyhow, a sacrifice needed to be made either before or after a battle and the king was supposed to wait for the prophet to come make the sacrifice.  He didn't. He made it himself.  Then the prophet showed up and was kind of ticked off.
That's what I remember.  Any idea on which king, which prophet, and/or which passage this is from?
Thanks!

Interactive Blog Post: I need YOUR help

Hello everyone who reads what I write
I'm working on a sermon (okay, I'm almost always working on a sermon) and I'd love it if you could share your stories about how requests or prayers or desired were answered or fulfilled in unexpected or unusual ways.  It doesn't necessarily have to be prayers like praying to a higher being, it can be anything, just unusual or unexpected ways that requests were fulfilled.  If I decide to use your story in my sermon,  will make every effort to contact you before hand and I will change all names to protect your privacy, because privacy is important.
You can either leave your story as a comment, private message it to me on Facebook or e-mail me at helpwithmysermon@gmail.com .
Thanks for your help!