'Blood' 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?

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."

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.