Abdullah bin Umar reported,

Ibn Umar divorced his wife while she was menstruating, so Umar mentioned this to the Prophet ﷺ, who said, "Let him take her back."I asked, "Will it count as a divorce?"He replied, "What else?"In another narration from Qatada, from Yunus bin Jubayr, from Ibn Umar, he said, "Command him to take her back."I asked, "Will it count as a divorce?"He replied, "What do you think if he becomes incapable or behaves foolishly?"

Bukhari 5252

Sahih

حدثنا سليمان بن حرب حدثنا شعبة عن أنس بن سيرين قال سمعت

ابن عمر قال

طلق ابن عمر امرأته وهي حائض فذكر عمر للنبي ﷺ فقال ليراجعها قلت تحتسب قال فمه وعن قتادة عن يونس بن جبير عن ابن عمر قال مره فليراجعها قلت تحتسب قال أرأيت إن عجز واستحمق

البخاري 5252صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Divorce
Chapter
If a menstruating woman is divorced, that divorce counts
Numbering
Darussalam 5252
Bukhari 5252