Biblical Law and Covenant

What binds the Christian conscience—and what no longer does? Across the modern church, few questions generate more confusion, division, and quiet guilt than disputes over Sabbath observance, tithing, and the continuing authority of Old Testament law. Are these practices timeless moral obligations, or covenant-specific commands now fulfilled in Christ? And by what authority are such claims made? Biblical Law and Covenant offers a clear, rigorous, and pastorally grounded answer. This book argues a single, decisive thesis: law, obligation, and sin are always covenantal realities. God does not govern His people through abstract moral systems detached from history, but through covenants that establish who is bound, to what commands, under which authority, and for what redemptive purpose. When a covenant is fulfilled, its signs and sanctions cease—without weakening holiness, obedience, or moral truth. Moving carefully through Scripture, the book demonstrates that: The Sabbath was never a creation ordinance, but a Mosaic covenant sign given to Israel and fulfilled in Christ The New Testament consistently refuses to bind believers to Sabbaths, festivals, or holy days, while explicitly protecting liberty of conscience Tithing functioned as Levitical provision, not a universal percentage law, and cannot be imposed under the New Covenant without distorting gospel freedom Christian generosity flows from grace, not compulsion, and cannot be legislated without reviving covenantal categories Scripture has closed Civil authority is ministerial, not covenantal, and biblical covenant law cannot be transferred to the state without collapsing jurisdictional boundaries Legalism arises whenever authority is asserted without jurisdiction, whether in church, family, or politics Along the way, Sayles engages respectfully but firmly with Reformed Sabbatarianism, theonomy, and Christian nationalism, drawing on Scripture and the witness of figures such as Calvin, Owen, Bunyan, Luther, Edwards, Schaeffer, and Bahnsen—while offering a distinctive jurisdictional analysis rooted in New Covenant theology. Extensive appendices address common objections in depth, including: Abraham and Melchizedek The myth of pre-law tithing Why Genesis 2 cannot bear Sabbath obligation John Bunyan’s decisive case for gospel liberty Modern category errors in law, church, and politics This is not an argument for lawlessness. It is a defence of rightful authority. Written with theological precision and pastoral clarity, Biblical Law and Covenant equips readers to obey Christ without false guilt, to honour Scripture without misusing it, and to preserve unity without surrendering truth. For readers seeking clarity where tradition, conscience, and Scripture collide, this book offers a decisive, biblically grounded resolution.