Communion is really the symbol of... God's new deal:
Old deal: Obey the law and you will have life-Exodus 24:4-8 NLT: "4 Then Moses carefully wrote down all the Lord's instructions. Early the next morning Moses got up and built an altar at the foot of the mountain. He also set up twelve pillars, one for each of the twelve tribes of Israel. 5 Then he sent some of the young Israelite men to present burnt offerings and to sacrifice bulls as peace offerings to the Lord. 6 Moses drained half the blood from these animals into basins. The other half he splattered against the altar. 7 Then he took the Book of the Covenant and read it aloud to the people. Again they all responded, 'We will do everything the Lord has commanded. We will obey.' 8 Then Moses took the blood from the basins and splattered it over the people, declaring, 'Look, this blood confirms the covenant the Lord has made with you in giving you these instructions.' "
New deal: Believe in God's Son and you will have life-Jeremiah 31:31-33 NLT, emphasis added: "31 'The day is coming,' says the Lord, 'when I will make a new covenant with the people of Israel and Judah. 32 This covenant will not be like the one I made with their ancestors when I took them by the hand and brought them out of the land of Egypt. They broke that covenant, though I loved them as a husband loves his wife,' says the Lord. 33 'But this is the new covenant I will make with the people of Israel after those days,' says the Lord. 'I will put my instructions deep within them, and I will write them on their hearts. I will be their God, and they will be my people.' "
Lord's Supper: The announcement of God's new deal with humanity 1 Corinthians 11:23-26 NLT, emphasis added: "23 For I pass on to you what I received from the Lord himself. On the night when he was betrayed, the Lord Jesus took some bread 24 and gave thanks to God for it. Then he broke it in pieces and said, 'This is my body, which is given for you. Do this to remember me.' 25 In the same way, he took the cup of wine after supper, saying, 'This cup is the new covenant between God and his people-an agreement confirmed with my blood. Do this to remember me as often as you drink it.' 26 For every time you eat this bread and drink this cup, you are announcing the Lord's death until he comes again."