Imam Mahdi (atjf)
‘On the authority of al-Thumāli: I asked Imam al-Baqir (as)
“O” son of the Messenger of Allah, aren’t all of you Establishers (Qa'im) of the Truth?”
He said, “Indeed so.”
I asked him then, “Why has al-Qā‘im has been named ‘the Establisher’ (al-Qā’im)?”
He said, “When my forefather Imam Hussain (as), was killed, angels wailed to Allah, the Exalted, and cried and whimpered.
They said, “Our Lord, our Master, are You going to ignore people who killed Your chosen friend and the progeny of Your chosen and selected friend from Your creation?”
Allah, the Exalted, revealed to them, “Relax my angels. By My Honor and My Majesty, I will take revenge from them, even if it be after a while.”
Then Allah, the Exalted, manifested the Imams from the progeny of Imam Hussain (a.s) which made the angels happy. They saw one of them standing (qā’im), offering salāth.
Allah, the Exalted, said, ‘Through that Standing one (al-Qā’im). I shall avenge from them.’”
Quoted in Ilal al Sharae
Book (Bihar Al Anwar, volume 51)