"The Messenger of Allah ﷺ said when bowing and prostrating: 'Subbuhun Quddusun Rabbul-mala'ikati war'ruh (Perfect, Most Holy, Lord of the Angels and the Spirit)."  

كَانَ رَسُولُ اللَّهِ ﷺ يَقُولُ فِي رُكُوعِهِ وَسُجُودِهِ سُبُّوحٌ قُدُّوسٌ رَبُّ الْمَلاَئِكَةِ وَالرُّوحِ