Our master Imam Sadiq (peace be upon him) in the book “Jamaali Ssaliheen” said: among our rights on the Shi’a is to place their hands on their chin after the obligatory prayers and recites the following (3) three times:
O Lord of Muhammad hasten the appearance of Muhammad’s progeny, O Lord of Muhammad preserve the occultation of Muhammad, O Lord of Muhammad avenge the children of Muhammad peace be upon them