The husband of Sayyidah Furay'ah bint Malik (may Allah be pleased with her), the sister of Abu Sa'id al-Khudri (may Allah be pleased with him), was killed at Taraf al-Qadum. She asked the Prophet (peace and blessings be upon him) for permission to go to her family in Madinah, and he (peace and blessings be upon him) gave permission, then he said: "No, (rather remain in your house) until the waiting period ('iddah) is completed."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21446