And he took bread, and when he had given thanks, he broke it and gave it to them, saying, “This is my body, which is given for you. Do this in remembrance of me.” Luke 22:19 ESV
See also: John 6:22-59.
And since this was a Seder, celebrating Passover, there is the Paschal Lamb. The Korban Pesach, which in the TaNaKh (so called Old Testament) provided an atonement for Israel. The Letter to the Hebrews shows that for the Believer, Jesus is the Perfect Lamb, Who, as John The Baptist rightly noted, takes away the sin of the world.