Muwatta Malik, Book 29, Hadith 89 (USC-MSA)

Yahya related to me from Malik that Hisham ibn Urwa said about a Bedouin woman whose husband died, that she was to stay where her people stayed. Malik said, "This is what is done among us."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، أَنَّهُ كَانَ يَقُولُ فِي الْمَرْأَةِ الْبَدَوِيَّةِ يُتَوَفَّى عَنْهَا زَوْجُهَا إِنَّهَا تَنْتَوِي حَيْثُ انْتَوَى أَهْلُهَا ‏.‏ قَالَ مَالِكٌ وَهَذَا الأَمْرُ عِنْدَنَا ‏.‏

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also referenced under: Book 29, Hadith 1253 (In-Book)