Abu Dawud Book 6, Hadith Number 2275.

Narated By Abdullah ibn Abbas : Women who are divorced shall wait, keeping themselves apart, three monthly courses; and then said: And for such of your women as despair of menstruation, if ye doubt, their period (of waiting) shall be three months. This was abrogated from the former verse. Again he said: (O ye who believe, if ye wed believing women) and divorce them before ye have touched them, then there is no period that ye should reckon.”