(56) باب عِدَّةِ الْحَامِلِ الْمُتَوَفَّى عَنْهَا زَوْجُهَا
It was narrated from Al-Miswar bin Makhramah that the Prophet commanded Sabai'ah to get married when her Nifas ended.
Reference: Sunan an-Nasa'i 3507
In-book reference: Book 27, Hadith 119
English translation: Vol. 4, Book 27, Hadith 3537