In this study we explore Paul’s instruction to believers married to unbelievers, where he clarifies that sanctification extends through covenantal presence, even within a mixed household. Paul assures the church that if the unbelieving partner departs, the believer is “not bound”—yet the greater calling remains peace, witness, and trust in God’s work through marriage. This passage challenges Corinthian anxieties about purity and status by reframing holiness as covenantal influence rather than contamination.