Every man praying or prophesying, having his head covered, dishonoureth his head. Praying, or prophesying - Any person who engages in public acts in the worship of God, whether prayer, singing, or exhortation: for we learn, from the apostle himself, that προφητευειν, to prophesy, signifies to speak unto men to edification, exhortation, and comfort, 1 Corinthians 14:3. And this comprehends all that we understand by exhortation, or even preaching.
Having his head covered - With his cap or turban on, dishonoreth his head; because the head being covered was a sign of subjection; and while he was employed in the public ministration of the word, he was to be considered as a representative of Christ, and on this account his being veiled or covered would be improper. This decision of the apostle was in point blank hostility to the canons of the Jews; for they would not suffer a man to pray unless he was veiled, for which they gave this reason. "He should veil himself to show that he is ashamed before God, and unworthy with open face to behold him." See much in Lightfoot on this point.