Mark 16:15 - And he said unto them, Go ye into all the world, and preach the gospel to every creature.

2 Timothy 2:24-26 - And the servant of the Lord must not strive; but be gentle unto all [men], apt to teach, patient,  

Romans 1:16 - For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.