The Birth of al-Husayn ibn Ali عليه السلام
Al-Kāfi|Volume 1|Book 4|Chapter 116
2ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ عَبْدِ الرَّحْمَنِ الْعَرْزَمِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ كَانَ بَيْنَ الْحَسَنِ وَالْحُسَيْنِ (عَلَيْهِ السَّلام) طُهْرٌ وَكَانَ بَيْنَهُمَا فِي الْمِيلادِ سِتَّةُ أَشْهُرٍ وَعَشْراً.
2. A number of our people has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from ‘Abd al-Rahman al-‘Arzami from Abu ‘Abdallah عليه السلام who has said the following. “The time between the birth of al-Hasan and the conception for al-Husayn was like one menstuaral cycle and the time between the birth of the two was six months and ten days.”
- Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (5/362)
- Ṣaḥīḥ al-Kāfī, vol. 1, p. 53