How do we know God's holiness is essential in worship?

God's holiness is essential in worship because it shapes how we approach Him and engage in His presence. The seriousness demonstrated in the Old Testament, where improper worship resulted in death, shows the gravity of honoring God's holiness. Worship should never be taken lightly; it requires an understanding of God's unapproachable nature and our need for mediation through the sacrifice of Christ. Proper worship recognizes this holiness and responds with reverence, as worship must align with God's nature and His commands for it to be acceptable.