Chapter 1 is a consideration of the theme of preaching Jesus and the gospel from the Old Testament. The author develops his theme by reflecting on John 5:31-47. In this text the importance of Scripture as a witness to the mission of Jesus Christ is unfolded. John refers also to other witnesses: John the Baptist, Jesus’ own works, and the Father. The author continues with a defence of the Old Testament as part of the Christian canon. He dismisses even those evangelicals that misuse the Old Testament especially through moralizing the texts. The chapter ends with a short overview of how the church throughout its history has interpreted the Old Testament.