'Cup' in the Bible

Is not the cup of blessing which we bless a sharing in the blood of Christ? Is not the bread which we break a sharing in the body of Christ?

You cannot drink the cup of the Lord and the cup of demons; you cannot partake of the table of the Lord and the table of demons.

In the same way He took the cup also after supper, 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 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 manner, shall be guilty of the body and the blood of the Lord.

But a man must examine himself, and in so doing he is to eat of the bread and drink of the cup.