"That a woman from Aslam who was called Subai'ah was married to her husband, and he died while she was pregnant. Abu As-Sanabil bin Ba'kak proposed to her but she refused to marry him. He said: 'You cannot get married until you have observed 'Iddah for the longer of the two periods.' Approximately twenty days later she gave birth. She went to the Messenger of Allah and he said: 'Get married.'"  

عَنْ أُمِّهَا أُمِّ سَلَمَةَ زَوْجِ النَّبِيِّ ﷺ أَنَّ امْرَأَةً مِنْ أَسْلَمَ يُقَالُ لَهَا سُبَيْعَةُ كَانَتْ تَحْتَ زَوْجِهَا فَتُوُفِّيَ عَنْهَا وَهِيَ حُبْلَى فَخَطَبَهَا أَبُو السَّنَابِلِ بْنُ بَعْكَكٍ فَأَبَتْ أَنْ تَنْكِحَهُ فَقَالَ مَا يَصْلُحُ لَكِ أَنْ تَنْكِحِي حَتَّى تَعْتَدِّي آخِرَ الأَجَلَيْنِ فَمَكَثَتْ قَرِيبًا مِنْ عِشْرِينَ لَيْلَةً ثُمَّ نُفِسَتْ فَجَاءَتْ رَسُولَ اللَّهِ ﷺ فَقَالَ انْكِحِي  

(the wife of the Prophet) A lady from Bani Aslam, called Subai'a, become a widow while she was pregnant. Abu As-Sanabil bin Ba'kak demanded her hand in marriage, but she refused to marry him and said, "By Allah, I cannot marry him unless I have completed one of the two prescribed periods." About ten days later (after having delivered her child), she went to the Prophet ﷺ and he said (to her), "You can marry now." (Using translation from Bukhārī 5318)  

عَنْ أُمِّهَا أُمِّ سَلَمَةَ زَوْجِ النَّبِيِّ ﷺ أَنَّ امْرَأَةً مِنْ أَسْلَمَ يُقَالُ لَهَا سُبَيْعَةُ كَانَتْ تَحْتَ زَوْجِهَا فَتُوُفِّيَ عَنْهَا وَهِيَ حُبْلَى فَخَطَبَهَا أَبُو السَّنَابِلِ بْنُ بَعْكَكٍ فَأَبَتْ أَنْ تَنْكِحَهُ فَقَالَ مَا يَصْلُحُ لَكِ أَنْ تَنْكِحِي حَتَّى تَعْتَدِّي آخِرَ الْأَجَلَيْنِ فَمَكَثَتْ قَرِيبًا مِنْ عِشْرِينَ لَيْلَةً ثُمَّ نُفِسَتْ فَجَاءَتْ رَسُولَ اللهِ ﷺ فَقَالَ «انْكِحِي»