Is the prostration for forgetfulness obligatory for one who says, "Allahu Akbar," after rising from bowing?

Question:
May Allah reward you. Honorable Shaykh, if the imam of the mosque says "Allahu Akbar" instead of "Sami' Allahu li man hamidah" when rising from bowing, is the prostration for forgetfulness obligatory for him?

Answer:
If he does this intentionally and says the takbir instead of the response, his prayer is invalid. However, if he was forgetful or ignorant, he must perform the prostration for forgetfulness, because he left an obligatory act, and leaving an obligatory act due to forgetfulness is rectified by the prostration for forgetfulness. Yes.