The Book of Pilgrimage (Kitab Al-Hajj)

Muslim :: Book 7 : Hadith 3105

Abu Huraira (Allah be pleased with him) reported Allah's Apostle (may peace be upon him) as saying: It is not lawful for a woman who believes in Allah and the Hereafter to undertake a day's journey except in the company of a Mahram.

Source materials are from the University of Southern California MSA site
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