Sahih Bukhari

Narrated Yunus Ibn Jubair:Ibn `Umar divorced his wife while she was having her menses. `Umar asked the Prophet (ﷺ) who said, ""Order him (your son) to take her back, and then divorced her before her period of the 'Iddah has elapsed."" I asked Ibn `Umar, ""Will that divorce (during the menses) be counted?"" He replied, ""If somebody behaves foolishly (will his foolishness be an excuse for his misbehavior)?