1 Cor 1:21, Rom 1:16, Col 4:3

Evangelism is testifying that Jesus is the Christ prophesied in the Old Testament. God revealed His Word through evangelism. (Titus 1:2-3)

Titus 1:2 In hope of eternal life, which God, that cannot lie, promised before the world began; 3 But hath in due times manifested his word through preaching, which is committed unto me according to the commandment of God our Saviour;

Evangelism seems foolish, but it is the power of God. (1 Cor 1:21, Rom 1:16)

1 Cor 1:21 For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe.

Rom 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.

Through evangelism and teaching, we must communicate deeply that Jesus is the Christ. (Col 4:3)

Col 4:3 Withal praying also for us, that God would open unto us a door of utterance, to speak the mystery of Christ, for which I am also in bonds: