Hadith 10:1352
Abu Bakr narrated to us, he said: Abd al-A’la narrated to us, from Hisham, from al-Hasan and Muhammad, they both said: If a man dies while she is in her waiting period, she shall observe the waiting period of a woman whose husband has died: four months and ten [days].
حدثنا أبو بكر قال نا عبد الأعلى عن هشام عن الحسن ومحمد قالا إن مات الرجل في عدتها اعتدت عدة المتوفى عنها زوجها أربعة أشهر وعشرا