27 Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of profaning the body and blood of the Lord. 28 Let a man examine himself, and so eat of the bread and drink of the cup. 29 For any one who eats and drinks without discerning the body eats and drinks judgment upon himself.
Many Protestants also has closed communion (Presbyterian, Lutheran, some baptist)
More from 1Cor 11
1 Corinthians 11
1Follow my example, as I follow the example of Christ.
*Propriety in Worship *
2I praise you for remembering me in everything and for holding to the teachings, just as I passed them on to you.
3Now I want you to realize that** the head of every man is Christ, and the head of the woman is man**, and the head of Christ is God. 4Every man who prays or prophesies with his head covered dishonors his head. 5And every woman who prays or prophesies with her head uncovered dishonors her head–it is just as though her head were shaved. 6If a woman does not cover her head, she should have her hair cut off; and if it is a disgrace for a woman to have her hair cut or shaved off, she should cover her head. 7A man ought not to cover his head, since he is the image and glory of God; but the woman is the glory of man. 8For man did not come from woman, but woman from man; 9neither was man created for woman, but woman for man. 10For this reason, and because of the angels, the woman ought to have a sign of authority on her head.
1 Corinthians 14
34As in all the congregations of the saints, women should remain silent in the churches. They are not allowed to speak, but must be in submission, as the Law says.
Now I’m more confused. How does one know which parts of 1 Corinthians still apply and which parts we can ignore?
In the Presbyterian Church USA, Holy Communion is open to all Christians.