Sayyidah Furay'ah bint Malik (may Allah be pleased with her) said: My husband went out in search of some non-Arab slaves of ours. He caught up with them at Taraf al-Qadum, and they killed him. The news of his death reached me while I was in a house far from the houses of my family. So I came to the Messenger of Allah (peace and blessings be upon him) and asked permission to go to my family. He (peace and blessings be upon him) gave permission, then said: "No, (not) until the waiting period ('iddah) is completed."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21455