[Machine] The Messenger of Allah ﷺ said, "Women wait for forty nights. If they see purity before that, then they are pure. But if they exceed the forty nights, then they are in the state of istihada (abnormal bleeding). They should wash and pray, and if bleeding overwhelms them, they should perform ablution for each prayer." "Amr bin Al-Husayn and Muhammad bin Uthatha are not among the two Sheikhs (referring to Abu Bakr and Umar), and I only mentioned this Hadith as a witness marveling."  

قَالَ رَسُولُ اللَّهِ ﷺ «تَنْتَظِرُ النُّفَسَاءُ أَرْبَعِينَ لَيْلَةً فَمَنْ رَأَتِ الطُّهْرَ قَبْلَ ذَلِكَ فَهِيَ طَاهِرٌ وَإِنْ جَاوَزْتِ الْأَرْبَعِينَ فَهِيَ بِمَنْزِلَةِ الْمُسْتَحَاضَةِ تَغْتَسِلُ وَتُصَلِّي فَإِنْ غَلَبَهَا الدَّمُ تَوَضَّأَتْ لِكُلِّ صَلَاةٍ» «عَمْرُو بْنُ الْحُصَيْنِ وَمُحَمَّدُ بْنُ عُلَاثَةَ لَيْسَا مِنْ شَرْطِ الشَّيْخَيْنِ وَإِنَّمَا ذَكَرْتُ هَذَا الْحَدِيثَ شَاهِدًا مُتَعَجِّبًا»  

"تَنْتَظِرُ النُّفَسَاءُ أَرْبَعِينَ يَوْمًا إِلَّا أن تَرَى الطُّهْرَ قَبْلَ ذَلَكَ، فَإِنْ بَلَغَتْ أَربعين يَوْمًا وَلَم تَرَ الطُّهْر فَلتَغْتَسِل، وَهِى بِمَنْزِلَةِ الْمُسْتَحَاضَةِ".