Status of Hadeeth Concerning Virtue of Hijab
Question

                I would like to find out about the soundness of the hadeeth which says: “If the woman who is covered completely walks on urine it will purify it.”

Is this hadeeth saheeh (authentic)? What is the full text?
Praise be to Allah.
    We could not find any hadeeth with the meanings mentioned in 
    the question or even any hadeeth that is close to it, but hijab (proper 
    dressing of Muslim women in public) is sufficient as a virtue, as Allah, may 
    He be glorified and exalted, has enjoined it in His Holy Book. Allah says 
    (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 Allah is Ever Oft‑Forgiving, Most Merciful.”

    [al-Ahzab 33:59]. 

    So the woman who covers herself is adhering to the command of 
    Allah and obeying His law. The one who is like that is deserving of 
    forgiveness from Allah, may He be glorified and exalted. 

    And Allah says (interpretation of the meaning): 

    “Verily, the Muslims (those who submit to Allah in Islam) men 
    and women, the believers men and women (who believe in Islamic Monotheism), 
    the men and the women who are obedient (to Allah), the men and women who are 
    truthful (in their speech and deeds), the men and the women who are patient 
    (in performing all the duties which Allah has ordered and in abstaining from 
    all that Allah has forbidden), the men and the women who are humble (before 
    their Lord Allah), the men and the women who give Sadaqat (i.e. Zakah and 
    alms), the men and the women who observe Sawm (fast) (the obligatory fasting 
    during the month of Ramadân, and the optional Nawafil fasting), the men and 
    the women who guard their chastity (from illegal sexual acts) and the men 
    and the women who remember Allah much with their hearts and tongues. Allah 
    has prepared for them forgiveness and a great reward (i.e. Paradise).”

    [al-Ahzab 33:35]. 

    Al-‘Allamah al-Sa‘di (may Allah have mercy on him) said: 

    “… those who guard their chastity” means, against zina 
    (fornication or adultery) and that which leads to it. End quote. 

    Tayseer al-Kareem al-Rahman, p.664 

    It was narrated from Sahl ibn Sa‘d (may Allah be pleased with 
    him) that the Prophet (peace and blessings of Allah be upon him) said: 

    “Whoever protects that which is between his jaws and that 
    which is between his legs will be guaranteed Paradise.” 

    Narrated by al-Bukhari, no.6474 

    There is no doubt that the woman who observes hijab 
    completely and has the characteristics of chastity and modesty will protect 
    herself and her honour more than the one whose hijab is lacking and who 
    uncovers any part of her body, even if the latter also keeps away from zina 
    and what leads to it. 

    Hence Allah has promised to the women who adopt complete 
    hijab and protect their honour from haram (unlawful) things, forgiveness and 
    a great reward, and the Prophet (peace and blessings of Allah be upon him) 
    guaranteed that they would enter Paradise. 

    And Allah knows best.