This sermon explores the Old Testament laws regarding priestly conduct and sacrificial offerings in Leviticus 21-22, highlighting the rigorous standards of holiness required for those mediating between God and Israel. The preacher contrasts these temporary, flawed human mediators with Jesus Christ, who fulfills the role of the perfect High Priest and spotless Lamb. By examining the physical and moral purity demanded of Levitical priests, the message demonstrates that no human effort can achieve true righteousness or atone for sin. Instead, believers are called to recognise their union with Christ, who alone provides the spiritual wholeness and access to God necessary for a holy priesthood. The central theme emphasises that sanctification is entirely God's work, inviting listeners to rest in the completed work of Jesus rather than their own imperfect offerings.