Al-Kāfi - Volume 3 > First Time Hayd (menses)
Hadith #1

1ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عُثْمَانَ بْنِ عِيسَى عَنْ سَمَاعَةَ بْنِ مِهْرَانَ قَالَ سَأَلْتُهُ عَنِ الْجَارِيَةِ الْبِكْرِ أَوَّلَ مَا تَحِيضُ فَتَقْعُدُ فِي الشَّهْرِ فِي يَوْمَيْنِ وَفِي الشَّهْرِ ثَلاَثَةَ أَيَّامٍ وَيَخْتَلِفُ عَلَيْهَا لاَ يَكُونُ طَمْثُهَا فِي الشَّهْرِ عِدَّةَ أَيَّامٍ سَوَاءً قَالَ فَلَهَا أَنْ تَجْلِسَ وَتَدَعَ الصَّلاَةَ مَا دَامَتْ تَرَى الدَّمَ مَا لَمْ تَجُزِ الْعَشَرَةَ فَإِذَا اتَّفَقَ الشَّهْرَانِ عِدَّةَ أَيَّامٍ سَوَاءً فَتِلْكَ أَيَّامُهَا.

1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ‘Uthman ibn ’Isa from Sama‘ah ibn Mehran who has said the following: “I once asked him (the Imam), ‘Alayhi al-Salam, about the case of a young girl who experiences Hayd (menses) for the first time. In one month she experiences for two days and in the second month for three days and so they are not certain days of known duration every month. He (the Imam) said, ‘ She must deal with it like Hayd (menses) and stop performing Salah (prayer) as long as there is discharge which is not more than ten days. If the duration of her Hayd (menses) in two months remains the same, this establishes a pattern for her Hayd (menses).”’