Hazrat Ali describes how muslims will come under intense pressure in the time of Hazrat Mahdi (as), but that Hazrat Mahdi's (as) community will never be afraid

It is related from Hazrat Ali that someone once asked him about Hazrat Mahdi (as). Hazrat Ali replied, “He (Hazrat Mahdi (as) will appear in the End Times. He will come at a time when people are condemned to death for saying ‘Allah’.” He then went on to say, "ALLAH WILL BRING TOGETHER AROUND HIM A COMMUNITY WHO FEAR NOTHING AND WHO REJOICE OVER NO GAIN.”  (Siddiq Hasan Khan, al-Izan, p.128)