1 Corinthians 11:4-7
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4Any man who prays or prophesies with his head covered dishonors his head, 5but any woman who prays or prophesies with her head unveiled dishonors her head--it is the same as if her head were shaven. 6For if a woman will not veil herself, then she should cut off her hair; but if it is disgraceful for a woman to be shorn or shaven, let her wear a veil. 7For a man ought not to cover his head, since he is the image and glory of God; but woman is the glory of man.
1 Corinthians 11:4-7 (RSV)