The ruling on prostrating at the prostration of the letter Sad within the prayer and outside of it

The questioner:
I am Sayyid Yusuf. Is the prostration in the prayer specific to the Prophet (peace and blessings be upon him)?

The Shaykh:
The letter Sad is not prostrated to in the prayer, but outside the prayer there is no harm; the Muslim may prostrate if he wishes, yes, following the Prophet of Allah (peace and blessings be upon him), yes, outside the prayer there is no harm. As for in the prayer, they even said that it invalidates the prayer. In the text of al-Zad, it states that the prayer is invalidated if one prostrates at Sad, because it is a prostration of gratitude and not a prostration of recitation, and what is prescribed in the prayer is only the prostration of recitation.

The questioner:
Okay.

The Shaykh:
If he prostrated out of ignorance, his prayer is valid, if Allah wills. In fact, some scholars say his prayer is valid even if he was not ignorant, because this prostration is attached to the recitation. Yes, Allah knows best. No, in any case, the most cautious course is that he does not prostrate in the prayer, the prostration of Sad, outside the prayer, yes.