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)?"
Reference: Sahih al-Bukhari 5333 In-book : Book 68, Hadith 78 USC-MSA web (English) : Vol. 7, Book 63, Hadith 250 (deprecated)
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