Sahih Bukhari

Narrated Anas bin Seereen:Ibn `Umar said: ""I divorced my wife while she was menstruating. `Umar mentioned that to the Prophet . The Prophet (ﷺ) said, (to my father), ""Let your son take her back."" I asked (Ibn `Umar), ""Is such a divorce counted (i.e. as one legal divorce)?"" Ibn `Umar said, ""Of course."" Narrated Yunus bin Jubair: Ibn `Umar said, ""The Prophet (ﷺ) said to `Umar, 'Order him (Ibn `Umar) to take her back.' "" I asked, ""Is such a divorce counted (as one legal divorce)?"" Ibn `Umar said, ""What do you think if someone becomes helpless and foolish?