If you ever visit Imam Askari (pbuh)’s successor
Hemyari said: Uthman Ibn Sa’eed (the first deputy of Imam al-Mahdi (hgr)) and I were near Ahmad Ibn IsḥÄq.
Ahmad Ibn IsḥÄq insinuate to me to ask Uthman Ibn Sa’eed about the successor of Imam Askari (pbuh).