"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)."
Reference: Sunan an-Nasa'i 1134 In-book : Book 12, Hadith 106 English translation : Vol. 2, Book 12, Hadith 1135
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