The husband of Sayyidah Furay'ah (may Allah be pleased with her) was killed at al-Qadum. She came to the Prophet (peace and blessings be upon him) and said that her husband had been killed at al-Qadum and that she had family, so he (peace and blessings be upon him) ordered her to move; but when she turned to leave, he (peace and blessings be upon him) called her and said: "Remain in your house until the waiting period ('iddah), that is, four months and ten days, is completed."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21450