Hajj

Malik :: Book 20 : Hadith 20.77.263

Malik said, concerning a woman who had never been on hajj, "If she doesn't have a mahram, or if she has, but he cannot come with her, she does not abandon Allah's making of the hajj obligatory for her. Let her go in a group of women."

Source materials are from the University of Southern California MSA site
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