Whenever the word “sacrifice” appears in the four Gospels, it is always in connection with the ritual sacrifice of animals in the Temple, for instance, the Passover lamb (Mark 14:12, Luke 22:7).
Jesus’s words spoken at the Last Supper establish the connection between his impending death on the Cross and the forgiveness of sins. In the Gospels, the institution of the Eucharist in its fullest form is found in Luke 22:15-20. Shorter forms are in Matt 26:26-29, Mark 14:22-25, and John 6:51. Paul also gives a shorter form in 1 Cor 11:23-25.
“This is my blood of the covenant, which will be shed for many for the forgiveness of sins.”.(Matt 26:28)