Juwairiyah bint Al-Harith (May Allah be pleased with her), the Mother of the Believers, reported: Allah’s Messenger (ﷺ) came out from (her apartment) in the morning as she was busy in observing her dawn prayer in her place of worship. He came back in the forenoon and she was still sitting there. He (the Holy Prophet) said to her:
You have been in the same seat since I left you. She said: Yes. Thereupon Allah’s Apostle (ﷺ) said: I recited four words three times after I left you and if these are to be weighed against what you have recited since morning these would outweigh them and (these words) are:

سُبْحَانَ اللَّهِ وَبِحَمْدِهِ عَدَدَ خَلْقِهِ وَرِضَا نَفْسِهِ وَزِنَةَ عَرْشِهِ وَمِدَادَ كَلِمَاتِهِ

Hallowed be Allah and praise is due to Him according to the number of His creation and according to the pleasure of His Self and according to the weight of His Throne and according to the ink (used in recording) words (for His Praise).
Sahih Muslim Book 48, Hadith 106

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَعَمْرٌو النَّاقِدُ، وَابْنُ أَبِي عُمَرَ، – وَاللَّفْظُ لاِبْنِ أَبِي عُمَرَ – قَالُوا حَدَّثَنَا سُفْيَانُ، عَنْ مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ، مَوْلَى آلِ طَلْحَةَ عَنْ كُرَيْبٍ، عَنِ ابْنِ عَبَّاسٍ، عَنْ جُوَيْرِيَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم خَرَجَ مِنْ عِنْدِهَا بُكْرَةً حِينَ صَلَّى الصُّبْحَ وَهِيَ فِي مَسْجِدِهَا ثُمَّ رَجَعَ بَعْدَ أَنْ أَضْحَى وَهِيَ جَالِسَةٌ فَقَالَ ‏”‏ مَا زِلْتِ عَلَى الْحَالِ الَّتِي فَارَقْتُكِ عَلَيْهَا ‏”‏ ‏.‏ قَالَتْ نَعَمْ ‏.‏ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏”‏ لَقَدْ قُلْتُ بَعْدَكِ أَرْبَعَ كَلِمَاتٍ ثَلاَثَ مَرَّاتٍ لَوْ وُزِنَتْ بِمَا قُلْتِ مُنْذُ الْيَوْمِ لَوَزَنَتْهُنَّ سُبْحَانَ اللَّهِ وَبِحَمْدِهِ عَدَدَ خَلْقِهِ وَرِضَا نَفْسِهِ وَزِنَةَ عَرْشِهِ وَمِدَادَ كَلِمَاتِهِ ‏”‏ ‏.‏