Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:2-1502bʿMr
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السيوطي:٢-١٥٠٢b

"عن عمر قال: تَنْتَظِر النفساءُ أربعين ليلةً ثم تغتسلُ".  

[عب] عبد الرازق [قط] الدارقطنى في السنن

See similar narrations below:

Collected by Dārimī
darimi:994Abū al-Walīd al-Ṭayālisī > Abū ʿAwānah > Abū Bishr > Yūsuf b. Māhak > Ibn ʿAbbās

[Machine] "Women wait for about forty days or so."  

الدارمي:٩٩٤أَخْبَرَنَا أَبُو الْوَلِيدِ الطَّيَالِسِيُّ حَدَّثَنَا أَبُو عَوَانَةَ عَنْ أَبِي بِشْرٍ عَنْ يُوسُفَ بْنِ مَاهَكَ عَنِ ابْنِ عَبَّاسٍ قَالَ

«تَنْتَظِرُ النُّفَسَاءُ أَرْبَعِينَ يَوْمًا أَوْ نَحْوَهَا»