It is narrated from Nafi‘ that Sayyiduna ‘Abdullah bin ‘Umar (may Allah be pleased with them) used to say: When a slave gives his wife two divorces, she becomes unlawful for him until she marries another husband, whether his wife is a slave woman or free. The waiting period (‘iddah) of a free woman is three menstrual cycles, and the waiting period of a slave woman is two menstrual cycles.