Christ, as victim, removed the right of the Law to accuse and condemn those who believe in Him...

This means that the Law condemns all people. But Christ--without sin--has borne the punishment of sin. He has been made a victim for us and has removed that right of the Law to accuse and condemn those who believe in Him. He Himself is the Atonement for them. For His sake they are now counted righteous.
~BOC, AP, V (III), 58

Christ's complete obedience given for us...

…He offered to His heavenly Father of us poor sinners His entire, complete obedience. This extends from His holy birth even unto death. In this way, He has covered all our disobedience, which dwells in our nature, and its thoughts, words, and works. So disobedience is not charged against us for condemnation. It is pardoned and forgiven out of pure grace alone, for Christ's sake.
~BOC, FSD, III, 58