An-Nur · 24:31

31. And tell the believing women to stop their eyes from looking at the private parts Allah has made unlawful for them to look at and to protect their private parts by staying far from indecency and by covering themselves. And they should not display their beauty to strangers except that which is apparent thereof and which cannot be hidden, such as clothing. They should draw their coverings over the openings at the top of their clothes, to cover their hair, faces and necks, and they should not expose their hidden beauty except to their husbands, or their fathers, or their husbands’ fathers, or their sons, or their husbands’ sons, or their brothers, or their brothers’ sons, or their sisters’ sons, or their women who are believers, be they Muslim or disbelievers, or the servants they own, be they male or female, or male attendants who have no desire for women, or children who have not become aware of the private aspects of women due to their being small. And women should not strike their feet with the intention of making known the adornment they are hiding, such as anklets and so forth. And all of you repent to Allah, O believers, for the gaze and so forth which affects you, in the hope that you are successful in attaining the goal and are saved from what is feared.