Sunan an Nasai
1134
Sahih+2

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)

SahihAbu Ghuddah
SahihAl-Albani