Proverbs 23:16
My inmost being will exult when your lips speak what is right.
Proverbs 8:6
Hear, for I will speak noble things, and from my lips will come what is right,
Ephesians 4:29
Let no corrupting talk come out of your mouths, but only such as is good for building up, as fits the occasion, that it may give grace to those who hear.
Ephesians 5:4
Let there be no filthiness nor foolish talk nor crude joking, which are out of place, but instead let there be thanksgiving.
Colossians 4:4
that I may make it clear, which is how I ought to speak.
James 3:2
For we all stumble in many ways. And if anyone does not stumble in what he says, he is a perfect man, able also to bridle his whole body.