Matthew 12:34
Ye brood of vipers, how can ye, being evil, speak good things? For out of the abundance of the heart the mouth speaketh.
Matthew 10:27
What I tell you in darkness, speak ye in the light; and what ye hear in the ear, proclaim on the house-tops.
Matthew 28:18-20
And Jesus came and spake to them, saying, All power is given me in heaven and in earth.
Mark 16:15
And he said to them, Go ye into all the world, and preach the gospel to every creature.
Acts 18:9-10
Then the Lord said to Paul by a vision, in the night, Fear not, but speak and hold not thy peace:
Romans 10:14-17
But how 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 a preacher?
Romans 15:18-21
For I will not dare to speak of any thing which Christ hath not done by me, to make the Gentiles obedient, by word and deed, Through mighty signs and wonders,
Ephesians 4:29
Let no corrupt discourse proceed out of your mouth, but that which is good, to the use of edifying, that it may minister grace to the hearers.
2 Timothy 2:2
And the things which thou hast heard from me before many witnesses, these commit to faithful men, who will be able to teach others also.
James 3:6
And the tongue is a fire, a world of iniquity: it is the tongue among the members which defileth the whole body and setteth on fire the course of nature, and is set on fire of hell.