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.
darimi:992Muḥammad b. Yūsuf > Sufyān > Ashʿath > ʿAṭāʾ

[Machine] "If it is customary for women, then she should sit for forty nights.  

الدارمي:٩٩٢أَخْبَرَنَا مُحَمَّدُ بْنُ يُوسُفَ حَدَّثَنَا سُفْيَانُ عَنْ أَشْعَثَ عَنْ عَطَاءٍ قَالَ

«إِنْ كَانَ لِلنُّفَسَاءِ عَادَةٌ وَإِلَّا جَلَسَتْ أَرْبَعِينَ لَيْلَةً»