Matthew 12:34
You brood of vipers! How can you, wicked as you are, say anything that is good? For the mouth talks about the things that fill the heart.
Matthew 10:27
What I speak to you in the dark, tell in the light, and what you hear whispered in your ears, you must proclaim from housetops.
Matthew 28:18-20
Then Jesus came up to them, and said, "Full authority in heaven and on earth has been given to me.
Mark 16:15
Then He said to them, "You must go all over the world and preach the good news to all the creation.
Acts 18:9-10
One night in a vision the Lord said to Paul, "Stop being afraid, go on speaking, never give up;
Romans 10:14-17
But how can people call upon One in whom they have not believed? And how can they believe in One about whom they have not heard? And how can people hear without someone to preach to them?
Romans 15:18-21
For I would venture to mention only what Christ has accomplished through me in bringing the heathen peoples to obedience, by word and by work,
Ephesians 4:29
You must stop letting any bad word pass your lips, but only words that are good for building up as the occasion demands, so that they will result in spiritual blessing to the hearers.
2 Timothy 2:2
The things you learned from me before many witnesses you must commit to trustworthy men who will be competent to teach others too.
James 3:6
And the tongue is a fire, and takes its place among the parts of our bodies as a world of evil; it soils the whole body and sets on fire the circle of man's nature, and itself is set on fire by hell.