What is the ruling on one who specifically recites verses containing a prostration in the Fajr prayer on Friday?

The Shaykh : As for the one who intentionally makes qunut in the Fajr prayer and intentionally performs the prostration of Friday... intentionally, and intentionally makes qunut.

The Shaykh : He performs the prostration intentionally.

The questioner : I mean he performs the prostration.

The Shaykh : Well, this is a recommended practice (sunnah); how can one mix a recommended practice with what is not a recommended practice, namely reciting Surat al-Sajdah and the prostration on Friday?

The questioner : [Surat al-Sajdah] is the whole surah, but he specifies a certain prostration. I do not mean the prostration and the person regarding Friday, but if he specifies it, that is... in the mosque.

Another questioner : I mean he specifies the prostration for Friday specifically, O Shaykh, and does not specify it for another night.

The Shaykh : Specification is not permissible except for what the Wise Lawgiver has specified, which is Surat al-Sajdah; anything other than that is not permissible.