'Drink the Cup' in the Bible

You are not able to drink the cup of the Lord, and the cup of demons: you are not able to partake of the table of the Lord, and the table of demons.

For as often as you may eat this bread, and drink the cup, you do proclaim the death of the Lord, until he may come.

So whosoever may eat the bread or drink the cup of the Lord unworthily, shall be guilty of the body and the blood of the Lord.