Hemyari said, “Uthman Ibn Sa’eed {the first deputy of Imam al-Mahdi (hgr)} and I were with Ahmad Ibn Isḥāq.

Ahmad Ibn Isḥāq pointed to me that I would ask Uthman Ibn Sa’eed about Imam Askari (pbuh)’s successor.

So, I obeyed and asked him so:

“I want to ask you something that I have no doubt about it… but I [just] would love to be sure,

As Abraham (pbuh) asked God to show him the resurrection of the dead, although he believed it, he asked for his confidence.

Imam Hādi and Imam Askari (pbuh th) introduced you as their trusty and loyal [friend].

Uthman Ibn Sa’eed prostrated, cried and said,”Ask your question”

Then I asked, “Have ever visited Imam Askari (pbuh)’s successor?”

He answered, “Yes, I swear to God” and we kept on speaking about the other points of this subject.

Milad, (Articles collection about birth of Imam Mahdi (hgr)), P.123

“Intizar Mo’ud” Journal, No.1