Narrated 'Amr bin al-'Aas (RA): "Do not confuse us about our Prophet's Sunnah: The period that a slave-woman, whose master dies, and she has begotten a child from him must wait for, is four months and ten days." [Reported by Ahmad, Abu Dawud and Ibn Majah. al-Hakim graded it Sahih (authentic), but ad-Daraqutni considered it defective due to Inqita' (broken link)] .