Ambrose of Milan

This, too, is plain, that in him who is baptized the Son of God is crucified, for our flesh could not do away sin unless it were crucified in Jesus Christ. And then it is written that: "All we who were baptized into Jesus Christ were baptized into His death." And farther on: "If we have been planted in the likeness of His death, we shall be also in the likeness of His resurrection, knowing that our old man was fastened with Him to His cross." And to the Colossians he says: "Buried with Him by baptism, wherein ye also rose again with Him." Which was written to the intent that we should believe that He is crucified in us, that our sins may be purged through Him, that He, Who alone can forgive sins, may nail to His cross the handwriting which was against us.