The Prophet Mohammad (PBUH&HP) has said:

… O' Ali! any one who kills you , he has actually killed me; anyone who dislikes you, he has disliked me; anyone who insults you, he has insulted me. Because you are from me, just like my soul; your spirit is from my spirit; your "Tinat" is from my "Tinat"; Allah -the Exalted and Glorified- created me and you; He selected me and you; He chose me for Prophet-hood and you for Imamat; Anyone who denies your Imamat, he has denied my Prophet-hood. O' Ali! You are my executor, you are the father of my offspring, you are the husband of my daughter, you are my successor and caliph in my people, during my life time and after. Your command is my command; your forbiddance is my forbiddance. I swear by He Who designated me His Prophet and chose me the best of His creations, you are the "Hojjat" (Proof) of Allah over His creations and you are he whom Allah has trusted His Secret to, and you are His Caliph over His servants.

(Oyoon Akhbaar Reza, ...)

O' our beloved Mahdi! We know that the Divine Permission for your Appearance can mend your broken heart, so we implore Allah, from the bottom of our hearts, to hasten your Ever-Anticipated Appearance … .