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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
darimi:823 – Muḥammad b. ʿĪsá > Muʿtamir from his father

[Machine] About women, you see blood during their pure days. He (meaning Hasan) said: "I see that she should wash herself and pray."  

الدارمي:٨٢٣ – أَخْبَرَنَا مُحَمَّدُ بْنُ عِيسَى حَدَّثَنَا مُعْتَمِرٌ عَنْ أَبِيهِ

عَنِ الْحَسَنِ فِي الْمَرْأَةِ تَرَى الدَّمَ أَيَّامَ طُهْرِهَا قَالَ «أَرَى أَنْ تَغْتَسِلَ وَتُصَلِّيَ»  

See similar narrations below:

Collected by Dārimī
darimi:894 – Muḥammad b. ʿĪsá > Muʿtamir from his father

[Machine] Regarding women, you may see blood during her clean days. He said, "I believe she should take a bath and perform prayers."  

الدارمي:٨٩٤ – أَخْبَرَنَا مُحَمَّدُ بْنُ عِيسَى حَدَّثَنَا مُعْتَمِرٌ عَنْ أَبِيهِ

عَنِ الْحَسَنِ فِي الْمَرْأَةِ تَرَى الدَّمَ فِي أَيَّامِ طُهْرِهَا قَالَ أَرَى أَنْ تَغْتَسِلَ وَتُصَلِّيَ