How do we know that Jesus accomplished our salvation?

The certainty of Christ's accomplishment of salvation is rooted in His sacrificial death. Hebrews 10:12 clarifies that Jesus, after offering one sacrifice for sins, sat down at the right hand of God, signifying the completion of His work. This assertion directly contrasts with the repetitive sacrifices of the Old Testament, which could never fully take away sin (Hebrews 10:4). Furthermore, the fulfillment of prophetic declarations in the Old Testament reinforces this truth, where it is promised that He would indeed take away sin (Isaiah 53:5). Therefore, His position of sitting down indicates a finality to the work of salvation, affirming that He has completely and effectually redeemed His people.