I am debtor both to the Greeks, and to the Barbarians; both to the …

Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: Teaching them to observe all things whatsoever I have commanded you.

Matthew 28:19 (KJV)

Go ye into all the world, and preach the gospel to every creature.

Mark 16:15 (KJV)

But when he saw the multitudes, he was moved with compassion on them, because they fainted, and were scattered abroad, as sheep having no shepherd. Then saith he unto his disciples, The harvest truly is plenteous, but the labourers are few; Pray ye therefore the Lord of the harvest, that he will send forth labourers into his harvest.

Matthew 9:37 (KJV)

And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things!

Romans 10:15 (KJV)

As they ministered to the Lord, and fasted, the Holy Ghost said, Separate me Barnabas and Saul for the work whereunto I have called them.

Acts 13:2 (KJV)

To the weak became I as weak, that I might gain the weak: I am made all things to all men, that I might by all means save some.

1 Corinthians 9:22 (KJV)