Law and Gospel

In Protestant Christianity, the relationship between Law and Gospel—God's Law and the Gospel of Jesus Christ—is a major topic in Lutheran and Reformed theology. In these traditions, the distinction between the doctrines of Law, which demands obedience to God's ethical will, and Gospel, which promises the forgiveness of sins in light of the person and work of Jesus Christ, is critical. It is used as a hermeneutical principle of biblical interpretation and a guiding principle in homiletics (sermon composition) and pastoral care. It is the supersession of the Old Covenant (including traditional Jewish law, or halakha) by the New Covenant and Christian theology.

Other Christian groups have a view on the issue as well, or more generally views of the Old Covenant, though it has not usually been as hotly debated or rigorously defined as in the Lutheran and Reformed traditions.

Sometimes the issue is discussed under the headings of "Law and Grace," "Sin and Grace," "Spirit and Letter," and "ministry (διακονíα, diakonia) of death/condemnation" and "ministry of the Spirit/righteousness".

...
Wikipedia