Matthew 12:34
Offspring of vipers, how can you, being evil, speak good things? For out of the abundance of the heart the mouth speaks.
Matthew 10:27
What I tell you in darkness, speak in the light, and what you hear in the ear, preach on the house-tops.
Matthew 28:18-20
And Jesus coming near spoke to them, saying, All power is given me in heaven and on the earth;
Mark 16:15
And he said to them, Go into all the world, preach the good news to all the creation;
Acts 18:9-10
And the Lord said to Paul, in a vision by night, Fear not, but speak and be not silent,
Romans 10:14-17
How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without one preaching?
Romans 15:18-21
for I dare not to speak of what Christ has not performed by me for the obedience of the nations, by word and work,
Ephesians 4:29
Let no evil word proceed out of your mouth, but that which is good for useful edification, that it may afford benefit to those that hear.
2 Timothy 2:2
and what you heard from me through many witnesses, these things commit to faithful men, who shall be competent to teach others also.
James 3:6
And the tongue is a fire, the tongue is made a world of wickedness among our members, it defiles the whole body and sets on fire the course of nature and is set on fire by hell.