Marriage is not casual in God’s eyes—it is sacred, precious, and covenantal. Drawing from Hebrews 13:4, this expository teaching explains what it means to honour marriage, keep the bed undefiled, and uphold God’s standard of sexual purity. With biblical definitions, concordance insights, and practical applications for singles, married couples, and leaders, this study calls believers back to holiness, faithfulness, and reverence for God’s design.