Matthew 12:34
O race of vipers, how can ye speak good things, who are yourselves so wicked? for out of the abundance of the heart the mouth speaketh.
Matthew 10:27
What I say to you in private, declare ye in public: and what ye hear as in the ear, preach ye as from the house-tops.
Matthew 28:18-20
And Jesus came and spake unto them, saying, All power is given unto me both in heaven and on earth.
Mark 16:15
And He said unto them, Go to all the world and preach the gospel to every one:
Acts 18:9-10
And the Lord said to Paul by a vision in the night, "Fear not, but speak: and be not silent:
Romans 10:14-17
But how shall they call upon him in whom they have not believed? and how shall they believe on him of whom they have not heard? and how shall they hear without a preacher?
Romans 15:18-21
For I shall not go about to speak of any thing, but what Christ hath wrought by me, (to gain the obedience of the Gentiles,) both in word and deed:
Ephesians 4:29
Let no corrupt word come out of your mouth; but what is good to useful edification, that it may benefit the hearers.
2 Timothy 2:2
and the things which thou hast heard from me, before many witnesses, these commit to faithful men, who shall be able to teach others also.
James 3:6
And the tongue is a fire, a world of iniquity: so is the tongue among our several parts, defiling the whole body, inflaming the course of nature, and is set on fire by hell.