Ruling on a woman exposing her hair in front of non-mahrams

Question:
His other question says: What is the ruling on a woman exposing her hair in front of non-mahrams? Is it considered an awrah (part of the body that must be covered)? And if a woman refuses to cover her hair, what must her husband do?
May Allah guide you.

Answer:
There is no doubt that exposing her hair to non-mahrams is what is wrong, and it is among the best of her adornment, and among the greatest of her adornment, and it is an awrah (part of the body that must be covered). So it is obligatory for her to cover it from all non-mahrams except her mahrams (relatives one may not marry). So she covers it from her husband's brother, from her sister's husband, from her husband's paternal uncle, from her husband's maternal uncle, from her paternal cousins, from her neighbors, and so on, and the rest of the non-mahrams, she covers it from them.
Also, it is obligatory to cover the face according to the correct view; because it is an awrah (part of the body that must be covered).
So the conclusion is: that the hair is an awrah (part of the body that must be covered) by consensus, as far as we know. There is no disagreement among the scholars of knowledge that it is obligatory to cover it. The disagreement is only regarding the face and the hands: is it obligatory to cover them or not? There are two opinions, and the stronger opinion is that covering is obligatory; because the face is the greatest adornment, and the most apparent adornment. Yes.