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

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

Therefore whoever eats the bread or drinks the cup of the Lord in an unworthy way, shall be guilty of the body and the blood of the Lord.

The Mystery of Resurrection

Now I say this, brothers and sisters, that flesh and blood cannot inherit the kingdom of God; nor does the perishable inherit the imperishable.