How do we know that Jesus finished the work of redemption?

The completion of redemption is rooted in Jesus’ sacrifice, which was perfect and final. Unlike the Old Testament priests who repeatedly offered sacrifices that could never take away sins, Jesus offered Himself once for all, perfecting forever those who are sanctified (Hebrews 10:14). His declaration of 'It is finished' signifies that the righteousness required by God's law was fully satisfied. Having accomplished this, He sat down at the right hand of God (Hebrews 10:12), indicating that His work was complete and accepted by the Father.