سُبُّوحٌ قُدُّوسٌ رَبُّ الملائِكَةِ وَالرُّوح
Subboohun quddoosun rabbul-mala-ikati warruh
Translation
Perfect, Holy, Lord of the angels and the Spirit.
When to recite
Recited in the bowing position (Ruku) during prayer.
Source / Reference
Muslim 1/533