Point me to the scripture that explains the consecration process that completes the
"...change of the whole substance of the bread into the body and the whole substance of the wine into the blood."
Read any of the Scriptures about the Last Supper.
Jesus’ institution of the Eucharist, as the sacramental expression of the Paschal Mystery. (Luke 24:13-35 and parallels, 1 Corinthians 11:24-25)