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 Messenger of Allah ﷺ 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."  

أَنْ يَدْخُلَ عَلَى سُبَيْعَةَ بِنْتِ الْحَارِثِ الأَسْلَمِيَّةِ فَيَسْأَلَهَا عَنْ حَدِيثِهَا وَعَنْ مَا قَالَ لَهَا رَسُولُ اللَّهِ ﷺ حِينَ اسْتَفْتَتْهُ فَكَتَبَ عُمَرُ بْنُ عَبْدِ اللَّهِ بْنِ الأَرْقَمِ إِلَى عَبْدِ اللَّهِ بْنِ عُتْبَةَ يُخْبِرُهُ أَنَّ سُبَيْعَةَ بِنْتَ الْحَارِثِ أَخْبَرَتْهُ أَنَّهَا كَانَتْ تَحْتَ سَعْدِ ابْنِ خَوْلَةَ وَهْوَ مِنْ بَنِي عَامِرِ بْنِ لُؤَىٍّ وَكَانَ مِمَّنْ شَهِدَ بَدْرًا فَتُوُفِّيَ عَنْهَا فِي حَجَّةِ الْوَدَاعِ وَهْىَ حَامِلٌ فَلَمْ تَنْشَبْ أَنْ وَضَعَتْ حَمْلَهَا بَعْدَ وَفَاتِهِ فَلَمَّا تَعَلَّتْ مِنْ نِفَاسِهَا تَجَمَّلَتْ لِلْخُطَّابِ فَدَخَلَ عَلَيْهَا أَبُو السَّنَابِلِ بْنُ بَعْكَكٍ رَجُلٌ مِنْ بَنِي عَبْدِ الدَّارِ فَقَالَ لَهَا مَا لِي أَرَاكِ تَجَمَّلْتِ لِلْخُطَّابِ تُرَجِّينَ النِّكَاحَ فَإِنَّكِ وَاللَّهِ مَا أَنْتِ بِنَاكِحٍ حَتَّى تَمُرَّ عَلَيْكِ أَرْبَعَةُ أَشْهُرٍ وَعَشْرٌ قَالَتْ سُبَيْعَةُ فَلَمَّا قَالَ لِي ذَلِكَ جَمَعْتُ عَلَىَّ ثِيَابِي حِينَ أَمْسَيْتُ وَأَتَيْتُ رَسُولَ اللَّهِ ﷺ فَسَأَلْتُهُ عَنْ ذَلِكَ فَأَفْتَانِي بِأَنِّي قَدْ حَلَلْتُ حِينَ وَضَعْتُ حَمْلِي وَأَمَرَنِي بِالتَّزَوُّجِ إِنْ بَدَا لِي  

A man came to Ibn ʿAbbas while Abu Huraira was sitting with him and said, "Give me your verdict regarding a lady who delivered a baby forty days after the death of her husband." Ibn ʿAbbas said, "This indicates the end of one of the two prescribed periods." I said "For those who are pregnant, their prescribed period is until they deliver their burdens." Abu Huraira said, I agree with my cousin (Abu Salama)." Then Ibn ʿAbbas sent his slave, Kuraib to Um Salama to ask her (regarding this matter). She replied. "The husband of Subai'a al Aslamiya was killed while she was pregnant, and she delivered a baby forty days after his death. Then her hand was asked in marriage and Messenger of Allah ﷺ married her (to somebody). Abu As-Sanabil was one of those who asked for her hand in marriage".  

أَفْتِنِي فِي امْرَأَةٍ وَلَدَتْ بَعْدَ زَوْجِهَا بِأَرْبَعِينَ لَيْلَةً فَقَالَ ابْنُ عَبَّاسٍ آخِرُ الأَجَلَيْنِ قُلْتُ أَنَا {وَأُولاَتُ الأَحْمَالِ أَجَلُهُنَّ أَنْ يَضَعْنَ حَمْلَهُنَّ} قَالَ أَبُو هُرَيْرَةَ أَنَا مَعَ ابْنِ أَخِي يَعْنِي أَبَا سَلَمَةَ فَأَرْسَلَ ابْنُ عَبَّاسٍ غُلاَمَهُ كُرَيْبًا إِلَى أُمِّ سَلَمَةَ يَسْأَلُهَا فَقَالَتْ قُتِلَ زَوْجُ سُبَيْعَةَ الأَسْلَمِيَّةِ وَهْىَ حُبْلَى فَوَضَعَتْ بَعْدَ مَوْتِهِ بِأَرْبَعِينَ لَيْلَةً فَخُطِبَتْ فَأَنْكَحَهَا رَسُولُ اللَّهِ ﷺ وَكَانَ أَبُو السَّنَابِلِ فِيمَنْ خَطَبَهَا