Muwatta Malik #1312
Divorce
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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."
About Muwatta Malik
This hadith is #1312 from Muwatta Malik, in the Book of Divorce.