'Cup' in the Bible

The cup of blessing that we give thanks for, is it not a sharing in the blood of Christ? The bread that we break, is it not a sharing in the body of Christ?

You cannot drink the cup of the Lord and the cup of demons. You cannot share in the Lord’s table and the table of demons.

In the same way, after supper He also took the cup and said, “This cup is the new covenant established by My blood. Do this, as often as you drink it, in remembrance of Me.”

For as often as you eat this bread and drink the cup, you proclaim the Lord’s death until He comes.

Therefore, whoever eats the bread or drinks the cup of the Lord in an unworthy way will be guilty of sin against the body and blood of the Lord.

So a man should examine himself; in this way he should eat the bread and drink from the cup.