 ٢ـ 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  who has said the following. “The time between the birth of al-Hassan and the conception for al-Husayn was like one menstuaral cycle and the time between the birth of the two was six months and tendays.”