Redemption comes from the marketplace where, in those days, slaves were purchased for a price. It speaks of the purchase of our salvation through the payment of a price for our sins… The New Testament also uses the related figure of ransom which refers to the price Jesus paid to purchase our salvation (Mark 10:45; 1 Tim. 2:6). The focus here is on the freedom we receive from the captivity of sin, through the price paid by Christ.
Ajith Fernando