Shedd and Hodge: Christ satsified the penalty and precept of the Law for His people

“But the law requires present and perfect obedience, as well as satisfaction for past disobedience. The law is not completely fulfilled by the endurance of penalty only. It must also be obeyed Christ both endured the penalty due to man for disobedience, and perfectly obeyed the law for him; so that He was a vicarious substitute in reference to both the precept and the penalty of the law. By his active obedience He obeyed the law, and by his passive obedience He endured the penalty. In this way his vicarious work is complete.” –William Shedd, "History of Christian Doctrine," quoted by Charles Hodge in “Systematic Theology,” vol. 3

“As Christ obeyed in suffering, his sufferings were as much a part of his obedience as his observance of the precepts of the law. The Scriptures do not expressly make this distinction, as they include everything that Christ did for our redemption under the term righteousness or obedience. The distinction becomes important only when it is denied that his moral obedience is any part of the righteousness for which the believer is justified, or that his whole work in making satisfaction consisted in expiation or bearing the penalty of the law. This is contrary to Scripture, and vitiates the doctrine of justification as presented in the Bible.” –Charles Hodge in “Systematic Theology,” vol. 3

"Christ sustained no other relation to the law, except so far as voluntarily assumed, than that which God himself sustains. But God is not under the law. He is Himself the primal, immutable, and infinitely perfect law to all rational creatures. Christ’s subjection to the law therefore, was as voluntary as his submitting to the death of the cross. As He did not die for Himself, so neither did He obey for Himself. In both forms of his obedience He acted for us, as our representative and substitute, that through his righteousness many might be made righteous." –Charles Hodge in “Systematic Theology,” vol. 3