Ibn ‘Umar (may Allah be pleased with him) said: "A slave has two counts of divorce to discharge toward his free wife, who shall observe a waiting period of three menstrual cycles. A free man has two counts of divorce to discharge toward his slave wife, who shall observe a waiting period of two menstrual cycles." Authentic hadith - Al-Bayhaqi - Narrated by Ad-Daraqutny - ‘Abdur-Razzaaq