‏الصلاة : Hadeeth No:809 Abu Huraira reported: The Messenger of Allaah (sallAllaahu alayhi wa sallam) said: When the Imam says:" Allaah listens to him who praises Him." you should say:" O Allaah, our Lord for Thee is the praise." for if what anyone says synchronises with what the angels say, his past sins will be forgiven....

‏الصلاة : Hadeeth No:1542 Jabir b. 'Abdullah reported: The Prophet of Allaah (sallAllaahu alayhi wa sallam) owed me a debt; he paid me back and made an addition (of this). I entered the mosque and he (the Prophet) said to me: Observe two rak'ahs of prayer....