Hadith 10:1111
Abu Bakr narrated to us, he said: Abd al-A’la narrated to us, from Ma’mar, from al-Zuhri, regarding the woman divorced three times and the woman whose husband has died: They both observe their waiting period in the houses of their husbands, and they both observe mourning.
حدثنا أبو بكر قال نا عبد الأعلى عن معمر عن الزهري في المطلقة ثلاثا والمتوفى عنها زوجها يعتدان في بيت زوجيهما ويحدان