It was narrated that 'Aishah said: "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)”"
SahihSahihSahih MuslimBook 12 · Hadith 106
سنن النسائي
It was narrated that 'Aishah said: "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)”"