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 (a.s.) 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.”