Al-Husayn bin Ali al-Hadi (a.s.) was a pure man of great knowledge and high morals. He was always with his brother Imam Abu Muhammad al-Hasan al-Askari (a.s.) and they were called “as-Sibtayn” like their two grandfathers Imam Hasan and Imam Husayn (a.s.). They were famous for this title at that time. Abu Hashim said, ‘One day, I rode on my sumpter and said: ‘(Glory be to Him Who made this subservient to us and we were not able to do it). One of as-Sibtayn heard me say that and said to me, ‘You have not been ordered of this, but you have been ordered to remember the blessing of your Lord on you when you ride on it (on the sumpter).’