What is the ruling on repeating the transitional takbirat if the worshiper repeats the takbir to sit for the first tashahhud, then the Imam stands for the third rak'ah? Does the worshiper repeat the tashahhud when following the Imam? And if the worshiper sits for the tashahhud in the first rak'ah, then remembers that he is in the first rak'ah, does he repeat the takbir for standing?

If the congregant stands up to follow the Imam without reciting the tashahhud, he should stand up while saying takbir, because there are two takbirs: one takbir when rising from prostration, and another takbir when standing up from a sitting position. However, if the worshipper mistakenly sits for the tashahhud in the first rak'ah and then realizes it, he should stand up without saying takbir.