2 Corinthians 5:17-18, 20

Wherefore if any man is in Christ, he is a new creature: the old things are passed away; behold, they are become new. But all things are of God, who reconciled us to himself through Christ, and gave unto us the ministry of reconciliation

We are ambassadors therefore on behalf of Christ, as though God were entreating by us: we beseech you on behalf of Christ, be ye reconciled to God.