Jesus Cleans More Than Sin Defiles

Ceremonial symbolism in the Old Testament uses the fundamental distinction between the clean and the unclean.  The comparison of sin to filth is linked with the need for cleanness to approach holy things of the holy Lord.  The prevailing power of sin is shown in the fact that the unclean pollutes the clean, never the other way round.  Haggai’s message focuses on this feature (Hag. 2:10-14).  In fulfillment, the prevailing power of Christ reveres this principle.  When Jesus touches a leper, Jesus is not defiled, the leper is cleansed…  – Edmund Clowney in Preaching Christ in All of Scripture