أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ أَنْبَأَنِي قَتَادَةُ، عَنْ مُطَرِّفٍ، عَنْ عَائِشَةَ، قَالَتْ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَقُولُ فِي رُكُوعِهِ " سُبُّوحٌ قُدُّوسٌ رَبُّ الْمَلاَئِكَةِ وَالرُّوحِ " .
It was narrated that Aishah said: "The Messenger of Allah (PBUH) used to say when bowing: 'Subbuhun Quddusun Rabbul-mala'ikati war-ruh (Perfect, Most Holy, is the Lord of the angels and the spirit).'" Translation Not Available
Book Ref: Sunan An Nisai Book 12 Hadith 1048
Web Ref: Sunan An Nisai Vol 2 Book 12 Hadith 1049