The merits of those who repeat what the Mu´adhdhin says

 199. ´Umar bin Khattab narrated that the Messenger of Allah salla alayhi wa sallam said: ´´When the Mu´adhdhin says: ´Allah is the Greatest, Allah is the Greatest,´ and you say: ´Allah is the Greatest, Allah is the Greatest,´ and when he says: ´I testify that there is no true God but Allah,´ you say: ´I testify that there is no true God but Allah,´ and when he says: ´I testify that Muhammad is the Messenger of Allah,´ and you say: ´I testify that Muhammad is the Messenger of Allah,´ and when he says: ´Come to prayer,´ and you say: ´There is no change of conditions nor power except by Allah,´ and when he says: ´Come to salvation,´ and you say: ´There is no change of conditions nor power except by Allah,´ and when he says: ´Allah is the Greatest, Allah is the Greatest,´ and you say: ´Allah is the Greatest, Allah is the Greatest,´ and when he says: ´There is no true God but Allah,´ and you say from your heart: ´There os not true God but Allah,´ you will enter Jannah.

narrated that the Messenger of Allah salla alayhi wa sallam said: ´´He who says on hearing the Mu´adhdhin: ´i testify that there is no God but Allah Alone, Who has no partner, and that Muhammad is His slave and His Messenger, (and that) I am satisfied with Allah as my Rubb (Lord), and with Muhammad as a Messenger, and with Islam as a Deen (religion),´ his sins would be forgiven.´