Deuteronomy 21:18–21 commands parents to deliver an insubordinate child over to government officials to the penalty of death when his destructive behavior is of a nature that it puts the community’s welfare at stake. How does this old covenant command relate to Christian parents today? This study seeks to provide an answer that grows out of the close, continuing, and complete biblical context and that accounts for the numerous New Testament uses of the law. First, it establishes the original revealed meaning and application of the law, noting also comparable laws in Exodus 21:15, 17, Leviticus 20:9, and Deuteronomy 27:16. Second, it determines the law’s theological significance by noting what it tells about God and his ways, by assessing from texts like Matthew 15:4, 1 Corinthians 5:13, and 1 Timothy 1:9–11 how Christ’s fulfillment of the law impacts it, and by stating in single sentence the love principle behind the law. Third, it summarizes the lasting significance of Deuteronomy 21:18–21 today, clarifying how it justifies not only a local church excommunicating formal members who are unrepentant but also a family relinquishing custody rights to an insubordinate child, thus making him or her a ward of the state. In both settings, God intends the loss as a gift of grace to the community––that others may “hear and fear” (Deut 21:21).