'Cup' in the Bible

Is the cup of blessing which we bless [at the Lord’s Supper] not a sharing in the blood of Christ? [Indeed it is.] Is the bread which we break not a sharing in the body of Christ? [Indeed it is.]

You cannot drink [both] the Lord’s cup and the cup of demons. You cannot share in both the Lord’s table and the table of demons [thereby becoming partners with them].

In the same way, after supper He took the cup, saying, “This cup is the new covenant [ratified and established] in My blood; do this, as often as you drink it, in [affectionate] remembrance of Me.”

For every time you eat this bread and drink this cup, you are [symbolically] proclaiming [the fact of] the Lord’s death until He comes [again].

So then whoever eats the bread or drinks the cup of the Lord in a way that is unworthy [of Him] will be guilty of [profaning and sinning against] the body and blood of the Lord.

But a person must [prayerfully] examine himself [and his relationship to Christ], and only when he has done so should he eat of the bread and drink of the cup.