Sunan an-Nasa'i, Volume 4, Book 27, Hadith 3537 (DarusSalam) ⓘ
It was narrated from Al-Miswar bin Makhramah that the Prophet commanded Sabai'ah to get married when her Nifas ended.
أَخْبَرَنَا نَصْرُ بْنُ عَلِيِّ بْنِ نَصْرٍ، عَنْ عَبْدِ اللَّهِ بْنِ دَاوُدَ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنِ الْمِسْوَرِ بْنِ مَخْرَمَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم أَمَرَ سُبَيْعَةَ أَنْ تَنْكِحَ إِذَا تَعَلَّتْ مِنْ نِفَاسِهَا .
also referenced under: Hadith 3507 (Reference) & Book 27, Hadith 119 (In-Book)