What did Prophet Muhammad (saw) say about the angels saying "Amin" during prayers?
 Narrated Abu Huraira:                     The Prophet said, "When the Imam says 'Amin', then you should all say 'Amin', for the angels say 'Amin' at that time, and he whose 'Amin' coincides with the 'Amin' of the angels, all his past sins will be forgiven."