'Cup' in the Bible

The cup of blessing, which we bless, does it not mean a joint-participation in the blood of Christ? The loaf of bread which we break, does it not mean a joint-participation in the body of Christ?

You cannot drink the Lord's cup and the cup of demons: you cannot be joint-partakers both in the table of the Lord and in the table of demons.

In the same way, when the meal was over, He also took the cup. "This cup," He said, "is the new Covenant of which my blood is the pledge. Do this, every time that you drink it, in memory of me."

For every time that you eat this bread and drink from the cup, you are proclaiming the Lord's death--until He returns.

Whoever, therefore, in an unworthy manner, eats the bread or drinks from the cup of the Lord sins against the body and blood of the Lord.

But let a man examine himself, and, having done that, then let him eat the bread and drink from the cup.