Scripture against obscenity

> **Possible Duplicate:** > [What does the Bible say about "bad" words?](https://christianity.stackexchange.com/questions/774/what-does-the-bible-say-about-bad-words) I know that swearing and using obscenity is wrong, but I'm curious what exactly are the Scriptures that support this. Is there any Scripture that clearly states that using obscenity is wrong? or is swearing/blaspheming/obscenity wrong because it violates key values and doctrines of Christianity?