Hadith 1253
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ قَالَ عِدَّةُ أُمِّ الْوَلَدِ إِذَا تُوُفِّيَ عَنْهَا سَيِّدُهَا حَيْضَةٌ .
Malik related to me from Nafi that Abdullah ibn Umar said, "The idda of an umm walad when her master dies is one menstrual period
Mauquf Sahih (Salim al-Hilali)
Muwatta Malik 1253 · Book 29, Hadith 50