"O' lord of the Believers, inform us about your Mahdi.." The lord of the believers said: "... He [HAZRAT MAHDI (AS)] Is the best refuge, the most knowledgeable, and the kIndest of you all. O' Allah, make the pledge of allegiance to him the occasion of exit from affliction, and unIte the dIspersIon of the Ummah through hIm. When it is permissible for you, do it, but do not turn away from hIm [HAZRAT MAHDI (AS)] if you find your way to him."
Kitab al-Ghaybat, [Bihar al-Anwar, Vol 51], Ansariyan Publishing, Compiler: `Allamah Muhammad Baqir al-Majlisi, Qom, 2003, p. 184.