1 Corinthians 11:4-5

4So, when you meet together to worship God, remember this. When a man prays to God, or he speaks a message from God, he should not cover his head. If he does that, he does not respect the one who is his head.

5But when a woman prays or she speaks a message from God, she should cover her head. If she does not cover her head, she does not respect the one who is her head. It would be as bad as if she cut off all her hair.