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:901Ḥajjāj > Ḥammād > Yūnus > al-Ḥasan

[Machine] "If a menstruating woman sees excessive bleeding after performing ritual ablution for one or two days, then she should refrain from offering prayers for a day. After that, she is considered to be with irregular bleeding (istihada)."  

الدارمي:٩٠١أَخْبَرَنَا حَجَّاجٌ حَدَّثَنَا حَمَّادٌ عَنْ يُونُسَ عَنِ الْحَسَنِ قَالَ

«إِذَا رَأَتِ الْحَائِضُ دَمًا عَبِيطًا بَعْدَ الْغُسْلِ بِيَوْمٍ أَوْ يَوْمَيْنِ فَإِنَّهَا تُمْسِكُ عَنِ الصَّلَاةِ يَوْمًا ثُمَّ هِيَ بَعْدَ ذَلِكَ مُسْتَحَاضَةٌ»