Yahya related to me from Malik that he had heard that Said ibnal-Musayyab and Sulayman ibn Yasar said, "The idda of a slave-girlwhen her husband dies is two months and five days." (ES)
USC-MSA web (English) reference: Book 29, Hadith 93 (ES)
Arabic reference (ES): Book 29, Hadith 1258 (ES)