How do we know Jesus was crucified for our sins?

The crucifixion of Jesus is central to salvation as it represents the fulfillment of God’s redemptive plan. Jesus, being completely innocent, took upon Himself the sins of humanity. 2 Corinthians 5:21 reveals this profound exchange—Christ became sin for us so that we might become the righteousness of God in Him. This exchange reassures believers that Jesus' crucifixion was not just an event but the ultimate act of love and justice, whereby our sins are placed upon Him, and His righteousness is credited to us.