Consider Colossians 4:2-6
2 Devote yourselves to prayer, being watchful and thankful. 3 And pray for us, too, that God may open a door for our message, so that we may proclaim the mystery of Christ, for which I am in chains. 4 Pray that I may proclaim it clearly, as I should. 5 Be wise in the way you act toward outsiders; make the most of every opportunity. 6 Let your conversation be always full of grace, seasoned with salt, so that you may know how to answer everyone. (Colossians 4:2-6)
This is a call to do evangelism, that is, to proclaim the gospel of Jesus Christ.
From time to time there is a little bit of discussion among Christian folk about what Paul means here. Is every Christian called to be an ‘evangelist’?