The enduring deeds,
the enduring righteous deeds.
The reward of saying "Amin" after the imam says "Amin":
On the authority of Abu Hurayrah (may Allah be pleased with him),
the Prophet (peace and blessings of Allah be upon him) said:
"When the reciter says 'Amin,' say 'Amin,'
for the angels also say 'Amin.'
So whoever's 'Amin' coincides with that of the angels,
all his past sins will be forgiven."
Related by al-Bukhari.