Firstly what is sin? It means a violation of God's will or religious law.
Case 1: mark 2: 1- 12(Jesus heals a paralyzed man)
Verse 5: when Jesus saw their faith, he said unto the sick of the palsy, Son thy sins be forgiven thee.
It is clearly shows from the above statement that the sick man had been living in sin, yet he needed healing.
In our contemporary world today, a lot of ministers want to pray for the sick without first check, is their sin in the life of this person.
For Jesus Christ to heal this sick man, he must first forgive him his sins. Then he blessed (healed) him.
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Case 2: John 5:1-14(Jesus heals a lame man)
Verse 14 :Afterward Jesus findeth him in the temple and said unto him, Behold, thou art made whole: sin no more lest a worse thing come thee.
From the passage quoted above,the man at the pool of Bethesada had been sicked for 38years. In God mercy, an angel is suppose to stir the water so that the sick could be healed, but as a surprise, Jesus himself came healed the man. He told him: sin no more lest a worse thing come unto thee.
We see again that someone has received his healing, he needs to stay clear from sin.
Case 3:John 8:1-11(The woman caught in the adultery)
Key verse 11: She said,No man ,Lord. And Jesus said unto her, neither do l condemn thee: go and sin no more.
Rom6:1-3 says shall we continue in sins that grace should abound, God forbid... After we had been healed, the grace that Christ provided through his death is enough to keep us free from sins. Thanks for your audience!