Ruling on covering the hands in the presence of non-mahram men

It is not permissible for a woman – especially if she says
that she wears niqaab – to mix with non-mahram men and to sit with them,
whether that is in school or at work. We have stated the ruling on mixing
and its evil consequences in our answers to questions no.
1200,
20784 and
12837. 

The evil consequences of mixing include men and women looking
at one another, which is haraam. Allaah has commanded the believing men and
women to lower their gaze and avoid looking at that which is not permissible
for them. 

It is not permissible for non-mahrams to see anything of her,
or for her to be careless about how she dresses so that anything appears of
her that it is not permissible for her to show.

Shaykh al-Islam Ibn Taymiyah said: 

The truth of the matter is that Allaah has made two types of
adornment: visible and invisible. It is permissible for a woman to show her
visible, outward adornment to people other than her husband and mahrams.
Before the verse of hijab was revealed the women used to go out without a
jilbaab and the men could see their faces and hands. When it was permissible
for a woman to show her face and hands, it was permissible to look at them
because it was permissible for a woman to show them. Then when Allaah
revealed the verse of hijab and said (interpretation of the meaning): 

“O Prophet! Tell your wives and your daughters and the
women of the believers to draw their cloaks (veils) all over their bodies
(i.e. screen themselves completely except the eyes or one eye to see the
way). That will be better, that they should be known (as free respectable
women) so as not to be annoyed. And Allaah is Ever Oft-Forgiving, Most
Merciful”

[al-Ahzaab 33:59] 

then the women began to observe hijab in front of men. 

The jilaab is a wrapper, which Ibn Mas’ood and others called
the rida’ (cloak), and which the common folk [i.e. at the time of Ibn
Taymiyah] call the izaar. It is a large izaar with which a woman covers her
head and the rest of her body. Moreover it may be said that when they were
commanded to wear the jilbaab lest they be recognized, this refers to
covering the face, or covering the face with a niqaab (face veil), hence it
may be understood that the face and hands are part of the beautify which
women are commanded not to show to non-mahrams. So there is nothing left
that it is permissible for non-mahrams to see except the outer garments. 

So the face, hands and
feet are not to be shown to non-mahrams according to the more sound of the
two scholarly opinions, unlike what used to happen before the abrogation,
indeed nothing is to be seen but the garment. 

Majmoo’ al-Fataawa, 22/110-114. 

In the answer to questions no.
11774 and
21536 we have
already stated the ruling on covering the hands and face. 

And Allaah knows best.