All we like sheep have gone astray; We have turned, every one, to his own way; And the LORD has laid on Him the iniquity of us all. Isa 53:6 NKJV
When God laid our sin on Jesus, God laid man, sins, weakness, infirmities, And diseases, our association with the tempter all on Jesus Christ. Jesus became sin with our sin. He be came sick with our sickness.
The Word of God says “Yet it was the will of the Lord to bruise Him; He has put Him to grief and made Him sick”. Isa 53:10 AMP
God does not want to see us sick. God wants us to have good and perfect health. God had laid our sickness on His Son Jesus Christ and made Him sick. Put it this way, in the eyes of God, all our sickness had been taken away.
“…And the LORD has laid on Him the iniquity of us all” here Jesus was made sin with our sin; the issue of redemption was taken care of totally. In the same manner Jesus Christ was made sick with our sickness. What God did for us in Christ Jesus is that burden of sickness had been taken off. Sickness is not for us anymore.