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For a man indeed ought not to cover his head, forasmuch as he is the image and glory of God: but the woman is the glory of the man. 11:7
Trivia: According to 1 Corinthians 11:6, what should you do with a woman who prays or prophesies without covering her head?
Paul says that the other apostles traveled with their wives - including Peter. We know from Mark 1:30 that Peter had a wife, since Jesus cured his mother-in-law. Paul confirms Peter's marital status here.