If he forgets the first Tashahhud and remembers it before the bowing (ruku') of the next rak’ah, he should return to sit immediately and perform the Tashahhud; he should also perform the prostrations of forgetfulness, after the prayer. If he remembers that he missed it after the Ruku, he should continue the prayers and he should make the Tashahhud up within the prostrations of forgetfulness.