The Messenger of Allah ﷺ used to open his prayer by saying, "Glory be to You, Allah, and praise be to You. Blessed is Your name and exalted is Your majesty, and there is no god but You."
حدثنا أبو بكر بن أبي شيبة حدثنا زيد بن الحباب حدثني جعفر بن سليمان الضبعي حدثني علي بن علي الرفاعي عن أبي المتوكل
كان رسول الله ﷺ يستفتح صلاته يقول سبحانك اللهم وبحمدك وتبارك اسمك وتعالى جدك ولا إله غيرك
[Its chain is hasan] Abu Dawud narrated it in the Book of Prayer, the chapter on those who considered the opening supplication to be "Subhanaka Allahumma wa bihamdika," hadith no. 775, from the hadith of Jafar, through this route, and Ibn Khuzayma graded it sahih.