|What is the ruling of niqab?
In the name of Allah, the most Beneficent, the most Merciful.
The awrah (nakedness) of a woman in front of a non-mahram (those with whom marriage is lawful) consists of the whole body except the face, hands and feet. (Raddul Muhtar p.531 v.9)
Niqaab (face cover) according to the scholars is not part of the awrah. However, wherever there is an apprehension of fitnah or temptation then it will be compulsory for a woman to cover her face.
Allahmah Ibn Abeedeen Shami (RA) has said: (“A young woman will be prevented from exposing her face) not because it is part of the awrah, rather (for the fear f temptation.”) (Raddul Muhtar P.532 V.9)
Wearing the hijab or niqaab is compulsory upon every woman who is close to the age of puberty or has reached it.
In regards to your question explain to the sister that wearing the niqaab is compulsory irrelevant whether she is married or not. It is a command from Allah (SWA). Furthermore, by her fulfilling the commands of Allah (SWA) and the Prophet of Allah Sallallahu Alahi Wasalm she will be rewarded abundtly.
Allah (SAW) in the Holy Quran has said:
“And whoever obeys Allah and his messenger achieves a great success.”
(Surah al –Ahzab V.71)
For a detailed article on the topic of hijaab, please click of the following link:
Only Allah Knows Best
Mohammed Tosir Miah
Darul Ifta Birmingham.