How do we know Christ suffered for our sins?

In several passages, including 1 Peter 3:18, it is emphasized that Christ, the sinless one, suffered once for sins. He bore the sins of His people and paid their penalty through His vicarious suffering. This means He acted as a substitute for believers, enduring the judgment that was due to them. Christ's suffering serves as a profound demonstration of God's love and justice, allowing believers to be reconciled to God. His resurrection confirms that sin has been dealt with, and the justification of the believer is secured through His sacrificial death.