How do we know Jesus Christ can rescue us?

The assurance of Jesus Christ's ability to rescue lies in His fulfillment of God's justice through His sacrifice. In Isaiah 49, God states that the prey and lawful captives will be delivered, indicating a promise of salvation through a mediator. Jesus, as the chosen servant mentioned in this passage, took on the sins of His people, died, and rose again to assure their freedom from the condemnation of the law. By His obedience and sacrificial death, the price for our sins was paid, demonstrating that He is our advocate who defends us against the accusations of sin and the justice of God.