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:814Yazīd b. Hārūn > Yaḥyá > al-Qaʿqāʿ b. Ḥakīm

[Machine] Oh nephew, no one is more knowledgeable about this than me. "If the menstrual cycle begins, let her abandon prayer. And when it ends, let her perform the ritual ablution and pray."  

الدارمي:٨١٤أَخْبَرَنَا يَزِيدُ بْنُ هَارُونَ أَخْبَرَنَا يَحْيَى أَنَّ الْقَعْقَاعَ بْنَ حَكِيمٍ أَخْبَرَهُ أَنَّهُ سَأَلَ سَعِيدًا عَنِ الْمُسْتَحَاضَةِ فَقَالَ

يَا ابْنَ أَخِي مَا بَقِيَ أَحَدٌ أَعْلَمُ بِهَذَا مِنِّي «إِذَا أَقْبَلَتِ الْحَيْضَةُ فَلْتَدَعِ الصَّلَاةَ وَإِذَا أَدْبَرَتْ فَلْتَغْتَسِلْ وَلْتُصَلِّ»