When Jesus showed up His basic message to Israel was, "Here is the end of the rope". You can never make it on your own. So Father God and the Lord Jesus Christ made covenant between themselves where we are the beneficiaries. This is why our performance has no relevance in this New Covenant. Instead it is based on Christ's perfect performance. So when it comes to our healing and health it is never based upon how good or upright we are.
There are three witnesses in the Word that prove beyond doubt that Jesus provided healing in the redemptive work on the cross. We see the first is Isaiah 53:3-5. This is the foundation Scripture for this study. The other two are found in Matthew and 1 Peter.