Verse 12: Leprosy was considered as a curse (2 Samuel 3:29) and lepers wore torn clothing, they lived outside the town, and needed to alarm others if approached by people (Levi 13:45). The leper knew that Jesus could heal him, if only He was willing.
Verse 13-14: Jesus rewarded the man’s request of faith, announced His willingness to cleanse the man. Contrary to Leviticus 5:3 which says never touch a leper, Jesus touched him and immediately the leprosy left him.
Jesus commanded the man to give a testimony to the priests, as the Mosaic Law commanded certain sacrifices upon the healing from leprosy (Leviticus 14:1-32)
Verse 15-16: The leper told many about healing despite the command of Jesus to tell no one (Mark 1:44-45). Due to the miraculous cleansing from leprosy, more crowds followed the Lord and he healed them all, which fulfilled the Messiah’s prophecy as a healer (Isaiah 35:5-6). Though people crowded around Jesus, Lord withdrew into the wilderness to pray (Mark 1:35).
Verse 20-21: As per the scriptures only God could forgive the iniquities (Isaiah 43: 25, Micah 7:18, Exod 34: 7). When Jesus said “sins are forgiven” to the paralytic, He was making himself equal to God. Jewish leaders couldn’t accept Jesus as God The Son, though they witnessed many miracles of Jesus (John 9:41)
Verse 22-23: The Lord searches every mind, and understands every plan and thought of humans (1Chronicles 28:9, Psalms 7:9). Jesus referred to Himself as “Son of Man” (Daniel 7:13-14) who was given with dominion (Matthew 28:19, Ephesians 1:22, 1 Peter 3:22), glory (John 1:14) and kingdom (John 18:36, Luke 12:32, Colossians 1:13-14)