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:910Muḥammad b. ʿĪsá > ʿAbd al-Wārith > ʿAmr > al-Ḥasan

[Machine] "If a woman prays two units of prayer (rak'ahs) and then experiences menstruation, she should not complete them when she becomes pure."  

الدارمي:٩١٠أَخْبَرَنَا مُحَمَّدُ بْنُ عِيسَى حَدَّثَنَا عَبْدُ الْوَارِثِ عَنْ عَمْرٍو عَنِ الْحَسَنِ قَالَ

«إِذَا صَلَّتِ الْمَرْأَةُ رَكْعَتَيْنِ ثُمَّ حَاضَتْ فَلَا تَقْضِي إِذَا طَهُرَتْ»