Hadith 512570
Chapter 29: Divorce - كتاب الطلاق
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ سَعِيدَ بْنَ الْمُسَيَّبِ، وَسُلَيْمَانَ بْنَ يَسَارٍ، كَانَا يَقُولاَنِ عِدَّةُ الأَمَةِ إِذَا هَلَكَ عَنْهَا زَوْجُهَا شَهْرَانِ وَخَمْسُ لَيَالٍ .
Yahya related to me from Malik that he had heard that Said ibn al-Musayyab and Sulayman ibn Yasar said, "The idda of a slave-girl when her husband dies is two months and five days."
Reference Muwatta Malik 512570
USC-MSA web (English) reference : Book 29, Hadith 93