Proverbs 8:6
Hear, for I will speak excellent things. And the opening of my lips shall be right things.
Ephesians 4:29
Let no corrupt speech go out of your mouth, rather if there is any good word for edification of a need, so that it may give grace to those who hear.
Ephesians 5:4
also indecency, and foolish talking or jesting, things not befitting, but thankfulness instead.
Colossians 4:4
so that I may make it known as I ought to speak.
James 3:2
For we all stumble in many things. If any man does not stumble in word, this is a perfect man, able also to bridle the whole body.