1 Corinthians 11:4

4Everyπᾶςmanἀνὴρprayingπροσευχόμενοςorἢprophesyingπροφητεύων[anything] onκατὰ[his] headκεφαλῆςhavingἔχωνdishonorsκαταισχύνειtheτὴνheadκεφαλὴνof himαὐτοῦ·

Every man praying or prophesying having [anything] on [his] head dishonors his head.