1 Corinthians 10:16-18 New International Version - UK (NIVUK)
16 Is not the cup of thanksgiving for which we give thanks a participation in the blood of Christ? And is not the bread that we break a participation in the body of Christ? 17 Because there is one loaf, we, who are many, are one body, for we all share the one loaf.
18 Consider the people of Israel: do not those who eat the sacrifices participate in the altar?