'Cup' in the Bible

The cup of blessing which we bless, is it not a participation in the blood of Christ? The bread which we break, is it not a participation in the body of Christ?

You are not able to drink the cup of the Lord and the cup of demons. You are not able to share the table of the Lord and the table of demons.

Likewise also the cup, after they had eaten, saying, "This cup is the new covenant in my blood. Do this, as often as you drink [it], in remembrance of me."

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

So then, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of the body and the blood of the Lord.

But let a person examine himself, and in this way let him eat from the bread and let him drink from the cup.