Divorce (Kitab Al-Talaq)

Dawud :: Book 12 : Hadith 2301

Narrated Amr ibn al-'As:

Do not confuse us about his Sunnah. Ibn al-Muthanna said: The Sunnah of our Prophet (peace_be_upon_him) is that the waiting period of a slave-mother whose husband has died is four months and ten days.

Source materials are from the University of Southern California MSA site
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