Matthew 12:34
"You generation of vipers! How can you speak good, when you are evil? For the mouth speaks what the heart is full of. "When the time of fruit drew near, he sent his slaves to the vine-dressers seized to get his fruit.
Matthew 10:27
"What I am telling you is in the darkness, do you speak in the light; and what is whispered in your ear, proclaim upon the housetops.
Matthew 28:18-20
And Jesus came forward to them and spoke to them, saying. "All authority has been given to me in heaven and on earth.
Mark 16:15
And he said to them. "Go into all the world and preach the gospel to the whole creation.
Acts 18:9-10
And the Lord said to Paul in a vision, by night. "Have no fear; go on speaking, and do not keep silent;
Romans 10:14-17
How then shall thy call upon Him in whom they do not believe? And how are they to believe in One of whom they have never heard? And how shall they hear without a preacher?
Romans 15:18-21
For I will not dare to speak of any thing except that which Christ has done through me to bring the Gentiles to obedience by word and deed,
Ephesians 4:29
From your lips let no evil words come forth, but such as occasion warrants, such as are good for upbuilding and give a blessing to the hearers.
2 Timothy 2:2
The teachings which you have heard from me, attested by many witnesses, deliver into the keeping of faithful men, who in their turn will be able to teach others also.
James 3:6
And the tongue is a fire; it is a very world of iniquity among our members, defiling the whole body, and setting on fire the wheel of nature, and is itself set on fire by hell.