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.