[MightyMasc]

From what i remember there is this famous du'a that is recited after every four Rak'ah of Taraweeh and there is a part:

....سبوح قدوس ربنا و رب الملائكة و الروح

But this is with a Seen not Saad.

for clarifying the issue. Now it made total sense to me, I request that OP edits original post as such. Here is a text from a Hadith from Sahih Muslim:

أَنَّ عَائِشَةَ نَبَّأَتْهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَقُولُ فِى رُكُوعِهِ وَسُجُودِهِ

سُبُّوحٌ قُدُّوسٌ رَبُّ الْمَلاَئِكَةِ وَالرُّوحِ