1 Corinthians 10:16-17

10:16 Is not the cup of blessing that we bless a sharing in the blood of Christ? Is not the bread that we break a sharing in the body of Christ? 10:17 Because there is one bread, we who are many are one body, for we all share the one bread.

1 Corinthians 10:21

10:21 You cannot drink the cup of the Lord and the cup of demons. You cannot take part in the table of the Lord and the table of demons.