Q. I recently heard an instance where a man divorced his wife and married the divorced wife’s sister the very next day! Because both women are sisters would he not have to wait for his first wife’s iddat to be completed before he can marry her sister?
A. Iddat is really for the wife and not for the husband. If the husband marries the wife’s sister during his wife’s iddat, then it will be haraam for him to revoke the divorce and take back the former wife as a second wife while married to the sister.
The prohibition for him is that at one given time, he cannot have two sisters as two wives in one marriage.
And Allah knows best.
Mufti Waseem Khan