Hadith: I recited four phrases, after I had left you, if they were to be weighed against what you have been reciting since morning, they would outweigh them. These are: Praise and glory be to Allah by the number of His creatures and His pleasure, and by the weight of His throne and the ink of His words

عن جويرية بنت الحارث رضي الله عنها قالت: قال لي رسول الله صلى الله عليه وسلم : «لقد قلت بعدك أربع كلمات، لو وُزِنَتْ بما قلت منذ اليوم لَوَزَنَتْهُنَّ: سبحان الله وبحمده، عدد خلقه ورضا نفسه وَزِنَةَ عرشه و مِدَادَ كلماته».
[صحيح] - [رواه مسلم]

Juwayriyah bint al-Hārith (may Allah be pleased with her) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said to her: "I recited four phrases, after I had left you, if they were to be weighed against what you have been reciting since morning, they would outweigh them. These are: Praise and glory be to Allah by the number of His creatures and His pleasure, and by the weight of His throne and the ink of His words."
Sahih/Authentic. - [Muslim]

Explanation

Juwayriyah (may Allah be pleased with her) reported that the Prophet (may Allah's peace and blessings be upon him) left her one day to perform Fajr prayer and returned in the forenoon. He found her remembering Allah, the Almighty,, so he informed her that he had recited four phrases after leaving her, were they to be weighed against what she was reciting, they would be either equal or heavier than hers in terms of reward. The Prophet (may Allah's peace and blessings be upon him) then mentioned these four phrases, saying: "Praise and glory be to Allah by the number of His creatures and His pleasure, and by the weight of His throne and the ink of His words." They mean that Allah is glorified and praised as much as the number of His creatures that only Allah knows; as great as it pleases Him; and as heavy as His Throne; and a continuous and endless praise and glorification.