470. hadíth
وَ - سَأَلَهُ مُحَمَّدُ بْنُ مُسْلِمٍ عَنْ عِدَّةِ اَلْمُسْتَحَاضَةِ فَقَالَ "تَنْتَظِرُ قَدْرَ أَقْرَائِهَا فَتَزِيدُ يَوْماً أَوْ تَنْقُصُ يَوْماً فَإِنْ لَمْ تَحِضْ فَلْتَنْظُرْ إِلَى بَعْضِ نِسَائِهَا فَلْتَعْتَدَّ بِأَقْرَائِهَا".
Muhammad ibn Muslim asked Imam (a.s) about the waiting period of a mustahadah (a woman experiencing continuous bleeding). Imam (a.s) said: "She should wait for the duration of her usual menstrual cycles, adding a day or subtracting a day. If she does not menstruate, then she should look at the menstrual cycles of some of the women like her and observe her waiting period according to their cycles."