The Prophet ﷺ said, "Two words light on the tongue, heavy on the scale, beloved to the Most Merciful: Glory be to Allah and praise to Him, glory be to Allah the Magnificent."
عن النبي ﷺ قال: كلمتان خفيفتان علي اللسان، ثقيلتان في الميزان، حبيبتان إلى الرحمن: سبحان الله وبحمده سبحان الله العظيم.
Bukhari narrated it in the Book of Supplications (6406), and Muslim in the Book of Remembrance and Supplication (2694), both of them through Ibn Fudayl, from Umara bin Qaqa, from Abu Zura, from Abu Hurairah, who mentioned it.