Asslamuu' Aliykum brothers my question is i want to wear niqaab and before i wear it i want to know the niqaab rules and i heard once u wear it u can't take it off is that true? advice plzz.

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.

The scholars differed in opinion with regard to the ruling on a woman covering her face and hands in front of marriageable men. For instance the view of Ahmad school and the correct opinion of the Shaafi'ee school is that it is an obligation on the woman to cover her face and hands, while Abu Haneefa's and Maalik's schools are of the view that it is not an obligation on her to cover them. So, the matter is an issue of Ijtihaad (a juristic opinion on matters which are not specified in the Quran or the Sunnah). Therefore, if one considers not having to cover the face and hand as the preponderant opinion, then others should not reprimand him/her for this, because the matter is controversial and tolerable. Nonetheless, there is no doubt that it is better to cover them.

Saying that whoever wears Niqaab (face covering) is not permitted to take it off again is not correct. Of course it is better if she does not take it off unless there is a preponderant benefit like for the purpose of treatment or in order to repel harm and the like.