Abu Dawud
Divorce
Book Number: 006 / Hadith Number: 2184
Narated By 'Aisha, Ummul Mu'minin : The Prophet (pbuh) said: The divorce of a slave-woman consists in saying it twice and her waiting period is two menstrual courses (qur') AbuAsim said: A similar tradition has been narrated to me by Muzahir and al-Qasim on the authority of 'Aisha from the Prophet (pbuh), except that he said: And her waiting period ('iddah) is two courses.