Whoever guards his mouth and tongue
Keeps his soul from troubles.
I'd like to draw your attention to a great resource on the topic of speech. Scott Brown's CD Gossip: The Plague of the Church is a very thought provoking and challenging message. I recently lent it to a friend, but after it is returned I am happy to lend it to anyone else I'm in physical contact with. As sisters (and brothers) in Christ, we need to hold one another accountable. I want my sisters in Christ to do this for me. It is very hard to be rebuked, but it is much less harmful than continuing in this sin. Wise women don't gossip, and we need to remind each other of that.
In Proverbs 21 there are also scriptures which are directly relevant to women's tongues . . .
Better to dwell in a corner of a housetop,
Than in a house shared with a contentious woman.
Proverbs 21: 9