The Word of God became flesh (John 1:14) so that he might save humans. There was no other way. The guilt of our sin required death (see Gen 2:17). Either we die and pay this penalty or someone worthy (i.e. one who has no sin) dies in our place. Jesus Christ was the only one worthy. He was a man and thus a suitable substitute, but he was also God and thus a worthy substitute for countless people who would believe. But our problem is bigger than just guilt. We we also bear the shame of our sin and all of its defilement. We must be made clean. God the Son became flesh, not only to die in our place for our sin and guilt, but also to cleanse us from the inside out. He did not shy away from flesh that is so easily defiled. He became flesh and in so doing made flesh clean, even when encountering the defiling forces of this fallen world.
Throughout the law we see that no one could make another clean. Only God makes clean. When Jesus was on earth he was so pure that he could touch those who were unclean and instead of becoming unclean himself, they were cleansed. He made them clean. No priest ever made one clean; priests merely pronounced one was clean after God had made them clean.1 What was different about Jesus? He was and is the God who is clean. He does not pronounce others clean, he makes them clean.
This, in part, is why he became man. He became man to cleanse us. Light drives out darkness simply by entering into a dark place. God drives out defilement of our flesh by taking on flesh himself.
1. We repeatedly read the phrase, “the priest shall pronounce him clean” in Leviticus 13 (vv. 6, 13, 23, 28, 34, 37 and also 14:7).
Other posts in this series
Cleansing from Defilement, Part 1: Introduction
Cleansing from Defilement, Part 2: The Danger of Defilement
Cleansing from Defilement, Part 3: Distinguishing between the Clean and Unclean
Cleansing from Defilement, Part 4: What Makes One Unclean?
Cleansing from Defilement, Part 5: Uncleanness is Contagious and Defiles the Camp
Cleansing from Defilement, Part 6: Defilement and Purity in the New Testament
Cleansing from Defilement, Part 7a: Jesus Christ Makes Us Clean
Cleansing from Defilement, Part 7b: Jesus Christ Makes Us Clean by His Baptism
Cleansing from Defilement, Part 7c: Jesus Christ Makes Us Clean by His Death and Resurrection
Cleansing from Defilement, Part 8: The Incarnation Was Necessary for Our Cleansing