One suitable word might be Apolutrosis, which appears in several Bible verses and refers to similar concepts to the English word redemption: liberation, deliverance, with the implication that this has been won by payment.
There are two words meaning "redeem. " "Lutron" literally means ransom, or give money to regain someone of value to you. "Exagorazo" means redeem in the sense of purchasing something back.
