Which ruling did Prophet Muhammad (peace be upon him) provide for Subaia bint Al-Harith regarding marriage after the death of her husband?
      Narrated Subaia bint Al-Harith:                     That she was married to Sad bin Khaula     who was from the tribe of Bani 'Amr bin Luai, and was one of those who     fought the Badr battle. He died while she wa pregnant during      Hajjat-ul-Wada.' Soon after his death, she gave birth to a child. When     she completed the term of deliver (i.e. became clean), she prepared      herself for suitors. Abu As-Sanabil bin Bu'kak, a man from the tribe      of Bani Abd-ud-Dal called on her and said to her, "What! I see you      dressed up for the people to ask you in marriage. Do you want to marry     By Allah, you are not allowed to marry unless four months and ten days     have elapsed (after your husband's death)." Subai'a in her narration      said, "When he (i.e. Abu As-Sanabil) said this to me. I put on my      dress in the evening and went to Allah's Apostle and asked him about      this problem. He gave the verdict that I was free to marry as I had      already given birth to my child and ordered me to marry if I wished."