[Machine] Regarding women, their menstrual period lasts six or seven days, then they may see brown or yellow discharge, or they may see a drop or two of blood. If this occurs, it does not invalidate their prayers and they are not harmed by it.
عَنْ عَلِيٍّ فِي «الْمَرْأَةِ يَكُونُ حَيْضُهَا سِتَّةَ أَيَّامٍ أَوْ سَبْعَةَ أَيَّامٍ ثُمَّ تَرَى كُدْرَةً أَوْ صُفْرَةً أَوْ تَرَى الْقَطْرَةَ أَوِ الْقَطْرَتَيْنِ مِنَ الدَّمِ أَنَّ ذَلِكَ بَاطِلٌ وَلَا يَضُرُّهَا شَيْءٌ»