This Hadith Is Munkar

Question :

Noble Shaikh, what is your view concerning this Hadith? Is it authentic, weak, or fabricated? And if it is weak, then is it permissible for us to apply it?

The Messenger of Allah said, "During the day or the night, pray twelve Rak'at, making Tashahhud after every two Rak'at. When you make your final Tashahhud, praise Allah and send prayers on the Prophet. And read while you are prostrating:

1) Surat Al-Fatihah seven times.

2) Ayat Al-Kursi seven times.

3) 'None has the right to be worshipped except Allâh alone, and He has no partner. To Him belongs the Dominion and to Him belongs all praises, and He is upon all things capable,' ten times.

4) 'O Allah, I ask You by the utmost mercy of Your Book, by Your greatest name'

Then you should ask for what you need. And finally, you should raise your head with the Taslim to your right and to your left. And do not teach it to the foolish, who will then pray it and be answered." Recorded by Al-Hakim; related by Ibn Mas'ud, may Allah be pleased with him.

Answer:

This is a rejected Hadith it is not an established saying of the Prophet ﷺ ,rather, he said :
"..Except that I have indeed been forbidden from reading the Qur'an while I am bowing or prostrating."

Therefore a person should not, when prostrating, recite the Qur'an, unless one is supplicating, using an invocation that is from the Qur'an, in which case there is no harm. So it is allowed, for example, to say:
"Our Lord! Let not our hearts deviate after You have guided us, and grant us mercy from You. Truly, You are the Bestower."

Ог
"Our Lord! Give us in this world that which is good and in the Hereafter that which is good, and save us from the torment of the Fire!

But this is an exception: under normal circumstances it is. forbidden for one to read the Qur'an while prostrating or bowing, and some scholars go even as far as to say that by doing so, one's prayer is nullified.

Source:
Ibn 'Uthaimeen
Fatawa Islamiyah, Vol. 7 Pages 210-211-212