Hisnul Muslim 35

While rukoo

سُبُّوحٌ، قُدُّوسٌ، رَبُّ المَلاَئِكَةِ وَالرُّوحِ

Subboohun, Quddoosun, Rabbul-malaa'ikati warrooh.

Glory (to You), Most Holy (are You), Lord of the angels and the Spirit.