English translation
2179. It was reported from Mālik, from Nāfi', from 'Abdullāh bin 'Umar that he divorced his wife while she was menstruating, during the time of the Messenger of Allāh ﷺ. 'Umar bin Al-Khaṭṭāb asked the Messenger of Allāh ﷺ regarding this, so the Messenger of Allāh ﷺ said: “Command him to take her back, then keep her until she is pure and then menstruates, and then becomes pure (again). Then, if he desires, he may keep her after that, and if he desires, he may divorce her before touching her. And that is the waiting period that Allāh has commanded to divorce women in.” (Sahih)
