What does the Bible say about the completed work of the Messiah?

According to Daniel 9:24, the Messiah was sent to accomplish six distinct purposes, including finishing transgression and reconciling iniquity. This points to the culmination of the redemptive work of Christ, who, through His sacrificial death and resurrection, addressed humanity's sinfulness and restored the relationship between God and His people. The New Testament affirms this by highlighting that Christ's atonement was planned from the foundation of the world, showcasing God's sovereignty in executing His purpose through His Son.