Narrated 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. "
Explanation & Benefits
Shaykh Umar Farooq Saeedi
Benefits and Issues:
Ibn Abbas (radi Allahu anhu) described this as abrogation (naskh) or exception (istithna), but in reality, these are different rulings for different situations.
The waiting period (‘iddah) for a generally divorced woman is three menstrual cycles (hayd) or three periods of purity (tuhr).
However, for a woman whose menstruation has stopped or who has not yet begun menstruating, her waiting period is three months. And for a woman who is divorced before seclusion (khalwah) and consummation (masas), there is no waiting period (‘iddah) for her at all.
Similarly, if a woman is pregnant and she is divorced or her husband passes away, her waiting period (‘iddah) is until she gives birth, whereas the waiting period (‘iddah) for a widow is four months and ten days.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 2282