The Book of Divorce
Ṣaḥīḥ Muslim 3657
مُرْهُ فَلْيُرَاجِعْهَا حَتَّى تَحِيضَ حَيْضَةً أُخْرَى مُسْتَقْبَلَةً سِوَى حَيْضَتِهَا الَّتِي طَلَّقَهَا فِيهَا فَإِنْ بَدَا لَهُ أَنْ يُطَلِّقَهَا فَلْيُطَلِّقْهَا طَاهِرًا مِنْ حَيْضَتِهَا قَبْلَ أَنْ يَمَسَّهَا فَذَلِكَ الطَّلاَقُ لِلْعِدَّةِ كَمَا أَمَرَ اللَّهُ
murhu falyurājiʿhā ḥattā taḥīḍa ḥayḍatan ukhrā mustaqbalatan siwā ḥayḍatihā at-tī ṭallaqahā fīhā fa-in badā lah an yuṭalliqahā falyuṭalliqhā ṭāhiran min ḥayḍatihā qabla an yamassahā fadhalika aṭ-ṭalāqu lilʿiddah kamā amara-Llāh
Transliteration generated from the Arabic vowel marks
The full narration
Abdullah b. 'Umar (Allah be pleased with them) reported:I divorced my wife while she was in the state of menses. 'Umar (Allah be pleased with him) made mention of it to Allah's Apostle (ﷺ) and he was enraged and he said: Command him to take her back until she enters the second ensuing menses other than the one in which he divorced her and in case he deems proper to divorce her, he should pronounce divorce (finally) before touching her (in the period) when she is purified of her menses, and that is the prescribed period in regard to divorce as Allah has commanded. 'Abdullah made a pronouncement of one divorce and it was counted in case of divorce. 'Abdullah took her back as Allah's Messenger (ﷺ) had commanded him
Source
Ṣaḥīḥ Muslim · 3657