Sunan an-Nasa'i 1134
سنن النسائي#1134SahihIt 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)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 12:106