:wa:
If you prayed in congregation and forgot to read
tashahhud after second
Rakat, that means you were the
imam, right?
Sitting for
Tashahhud and reading
tashahhud is
wajib and missing out a
wajib requires
Sajdah Sahw.
As far as I know, if you did not even make sajdah sahw then you will have to repeat the prayer. The scholars on board can confirm. @
Huzaifah ibn Adam, @
Aisha