1106. "Together with the anamnesis, the epiclesis is at the heart of each sacramental celebration, most especially of the Eucharist: You ask how the bread becomes the Body of Christ, and the wine . . ...
From the Gospel according to Matthew 27:59-61: Joseph took the body, and wrapped it in a clean linen shroud, and laid it in his own new tomb, which he had hewn in the rock; and he rolled a great stone ...