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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
bukhari:5319 – Yaḥyá b. Bukayr > al-Layth > Yazīd > Ibn Shihāb Katab Ilayh > ʿUbaydullāh b. ʿAbdullāh from his father > Katab > Ibn al-Arqam

that his father had written to Ibn Al-Arqam a letter asking him to ask Subai'a Al-Aslamiya how the Prophet had given her the verdict. She said, "The Prophet, gave me his verdict that after I gave birth, I could marry."  

البخاري:٥٣١٩ – حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ عَنِ اللَّيْثِ عَنْ يَزِيدَ أَنَّ ابْنَ شِهَابٍ كَتَبَ إِلَيْهِ أَنَّ عُبَيْدَ اللَّهِ بْنَ عَبْدِ اللَّهِ أَخْبَرَهُ عَنْ أَبِيهِ أَنَّهُ كَتَبَ إِلَى ابْنِ الأَرْقَمِ

أَنْ يَسْأَلَ سُبَيْعَةَ الأَسْلَمِيَّةَ كَيْفَ أَفْتَاهَا النَّبِيُّ ﷺ فَقَالَتْ أَفْتَانِي إِذَا وَضَعْتُ أَنْ أَنْكِحَ  

See similar narrations below:

Collected by Ṭabarānī
tabarani:21214 – Muṭṭalib b. Shuʿayb al-Azdī > ʿAbdullāh b. Ṣāliḥ > al-Layth > Yazīd b. Abū Ḥabīb > Ibn Shihāb Katab > ʿUbaydullāh b. ʿAbdullāh b. ʿUtbah b. Masʿūd from his father > Katab > Ibn al-Arqam

[Machine] I asked Subay'ah Al-Aslamiyah how the Messenger of Allah ﷺ instructed her when her husband passed away. She said, "He advised me that if I wish, I could remarry."  

الطبراني:٢١٢١٤ – حَدَّثَنَا مُطَّلِبُ بْنُ شُعَيْبٍ الْأَزْدِيُّ ثنا عَبْدُ اللهِ بْنُ صَالِحٍ حَدَّثَنِي اللَّيْثُ حَدَّثَنِي يَزِيدُ بْنُ أَبِي حَبِيبٍ أَنَّ ابْنَ شِهَابٍ كَتَبَ يَذْكُرُ أَنَّ عُبَيْدَ اللهِ بْنَ عَبْدِ اللهِ بْنِ عُتْبَةَ بْنِ مَسْعُودٍ أَخْبَرَهُ عَنْ أَبِيهِ أَنَّهُ كَتَبَ إِلَى ابْنِ الْأَرْقَمِ

أَنْ سَلْ سُبَيْعَةَ الْأَسْلَمِيَّةَ كَيْفَ أَمَرَهَا رَسُولُ اللهِ ﷺ حِينَ تُوُفِّيَ زَوْجُهَا؟ فَقَالَتْ «أَفْتَانِي إِذَا وَضَعْتُ أَنْ أَنْكِحَ»