Leon Morris in the context of "Redeemer (Christianity)"

Christian theology sometimes refers to Jesus using the title Redeemer or Saviour (alternatively, Savior). This references the salvation he accomplished, and is based on the metaphor of redemption, or "buying back". In the New Testament, redemption can refer both to deliverance from sin and to freedom from captivity.

Although the gospels do not use the title "Redeemer", the idea of redemption occurs in several of Paul's epistles. Leon Morris says that "Paul uses the concept of redemption primarily to speak of the saving significance of the death of Christ."