The Messenger of Allah ﷺ said, "Two phrases that are light on the tongue, heavy on the scale, and beloved to the Most Merciful: Subhan Allah wa bi-hamdihi, Subhan Allah al-Azeem."
حدثنا محمد بن فضيل عن عمارة عن أبي زرعة
قال رسول الله ﷺ كلمتان خفيفتان على اللسان ثقيلتان في الميزان حبيبتان إلى الرحمن سبحان الله وبحمده سبحان الله العظيم
Its isnad is sahih. Bukhari related it [11:173-175, 493, 13:451-452], and Muslim 2:310, both by way of Ibn Fudayl, with this same isnad. This is the hadith with which Bukhari concluded his great book, Al-Jami al-Sahih.