Matthew 12:34
You brood of vipers! how can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks.
Matthew 10:27
What I tell you in the dark, speak in the light; and what you hear whispered in your ear, proclaim on the housetops.
Matthew 28:18-20
And Jesus came and said to them, "All authority in heaven and on earth has been given to me.
Mark 16:15
And he said to them, "Go into all the world and preach the gospel to all creation.
Acts 18:9-10
And the Lord said to Paul one night in a vision, "Do not be afraid, but go on speaking and do not be silent;
Romans 10:14-17
How then can they call on him in whom they have not believed? And how can they believe in him of whom they have not heard? And how can they hear without a preacher?
Romans 15:18-21
For I will not venture to speak of anything except what Christ has accomplished through me to win obedience from the Gentiles, by word and deed
Ephesians 4:29
Let no unwholesome talk come out of your mouths, but only such as is good for building others up according to the need of the moment, that it may impart grace to those who hear.
2 Timothy 2:2
And the things you have heard from me in the presence of many witnesses, entrust to faithful men who will be able to teach others also.
James 3:6
And the tongue is a fire, a world of evil among the members of the body. The tongue corrupts our whole person, sets the whole course of our life on fire, and is itself set on fire by hell.