Answer
Mark 16:15
And he said to them, “Go into all the world and proclaim the gospel to the whole creation."
Exodus 4:10-12
But Moses said to the Lord, “Oh, my Lord, I am not eloquent, either in the past or since you have spoken to your servant, but I am slow of speech and of tongue.” Then the Lord said to him, “Who has made man's mouth? Who makes him mute, or deaf, or seeing, or blind? Is it not I, the Lord? Now therefore go, and I will be with your mouth and teach you what you shall speak.”
2 Timothy 2:15
Do your best to present yourself to God as one approved, a worker who has no need to be ashamed, rightly handling the word of truth.
James 3:1
Not many of you should become teachers, my brothers, for you know that we who teach will be judged with greater strictness.
1 Timothy 4:13
Until I come, devote yourself to the public reading of Scripture, to exhortation, to teaching.
2 Timothy 3:16
All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness,
1 Corinthians 1:21
For since, in the wisdom of God, the world did not know God through wisdom, it pleased God through the folly of what we preach to save those who believe.
2 Timothy 2:16
But avoid irreverent babble, for it will lead people into more and more ungodliness,
2 Timothy 4:2
Preach the word; be ready in season and out of season; reprove, rebuke, and exhort, with complete patience and teaching.
1 Corinthians 2:13
And we impart this in words not taught by human wisdom but taught by the Spirit, interpreting spiritual truths to those who are spiritual.
1 Corinthians 1:17
For Christ did not send me to baptize but to preach the gospel, and not with words of eloquent wisdom, lest the cross of Christ be emptied of its power.
Mark 1:15
And saying, “The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel.”
Matthew 4:17
From that time Jesus began to preach, saying, “Repent, for the kingdom of heaven is at hand.”
1 Corinthians 1:23
But we preach Christ crucified, a stumbling block to Jews and folly to Gentiles,
Romans 10:14
How then will they call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching?
Romans 1:15
So I am eager to preach the gospel to you also who are in Rome.
1 Corinthians 1:18
For the word of the cross is folly to those who are perishing, but to us who are being saved it is the power of God.
Romans 1:16
For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek.
Matthew 24:14
And this gospel of the kingdom will be proclaimed throughout the whole world as a testimony to all nations, and then the end will come.
Acts 1:8
But you will receive power when the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem and in all Judea and Samaria, and to the end of the earth.
Unless otherwise noted, all Bible verses are from The Holy Bible, English Standard Version® Copyright© 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.
Special thanks to OpenBible.info for the data on the most well-known Bible verses.