مُحَمَّدٌ عَنْ أَحْمَدَ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ مُوسَى بْنِ بَكْرٍ عَنْ زُرَارَةَ قَالَ
إِذَا نَظَرَتْ فَلَمْ تَجِدِ الْأَقْرَاءَ إِلَّا ثَلَاثَةَ أَشْهُرٍ فَإِذَا كَا��َتْ لَا يَسْتَقِيمُ لَهَا حَيْضٌ تَحِيضُ فِي الشَّهْرِ مِرَاراً فَإِنَّ عِدَّتَهَا عِدَّةُ الْمُسْتَحَاضَةِ ثَلَاثَةُ أَشْهُرٍ وَ إِذَا كَانَتْ تَحِيضُ حَيْضاً مُسْتَقِيماً فَهُوَ فِي كُلِّ شَهْرٍ حَيْضَةٌ بَيْنَ كُلِّ حَيْضَتَيْنِ شَهْرٌ وَ ذَلِكَ الْقُرْءُ .
10. Muhammad has narrated from Ahmad from Ali ibn al-Hakam from Musa ibn Bakr from Zurarah who has said the following:
“He (the Imam) 
, has said, ‘If she waits and does not find the Hayd (menses)-free period except three months then if her Hayd (menses) is not straight. If she experiences Hayd in a month several times such woman’s waiting period is like the waiting period of one who experiences Istihadah, whose ‘Iddah (waiting period) is three months. If she experiences Hayd straightly, thus, in every month is one Hayd and between two Hayd (menses) one month of time it is the Hayd-free period.’”
