I sat for the first tashahhud, and before the taslim I remembered, so I stood up and completed my prayer. Is sujud al-sahw required of me?

Question:
May Allah reward you with good and do you well. You also say: If you were in the first tashahhud and completed it, and before the taslim you remembered that you were in the first tashahhud, and you stood up and completed the prayer, is sujud al-sahw required of you?

Answer:
Yes, if you added to the first tashahhud by adding from the last tashahhud by mistake, then you prostrate for forgetfulness, because you added to the prayer an addition of its kind by mistake, so you prostrate for forgetfulness. This addition in sitting is an addition, but it is of the kind of the prayer, so sujud al-sahw is prescribed for you.