The Messenger of Allah ﷺ said, "When one of you bows, let him say three times, 'Glory be to my Lord, the Magnificent,' and that is the minimum. And when he prostrates, let him say, 'Glory be to my Lord, the Most High,' three times, and that is the minimum."
حدثنا عبد الملك بن مروان الأهوازي حدثنا أبو عامر وأبو داود عن ابن أبي ذئب عن إسحق بن يزيد الهذلي عن عون بن عبد الله
قال رسول الله ﷺ إذا ركع أحدكم فليقل ثلاث مرات سبحان ربي العظيم وذلك أدناه وإذا سجد فليقل سبحان ربي الأعلى ثلاثا وذلك أدناه
Its chain of transmission is daif.Narrated by Tirmidhi, Book of Prayer, chapter on what has been said about glorifying Allah during ruku and sujud, no. 261, and Ibn Majah, no. 890, from the hadith of Ibn Abu Dhib narrating it. Tirmidhi said, "Its chain is not connected. Awn bin Abdullah bin Utbah never met Ibn Masud, and Ishaq bin Yazid is unknown."