ENOfficial
Salman Farisi reported Allah's Messenger (ﷺ) as saying: Verily, there are one hundred (parts of) mercy for Allah, and it is one part of this mercy by virtue of which there is mutual love between the people and ninety-nine reserved for the Day of Resurrection.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنِي الْحَكَمُ بْنُ مُوسَى، حَدَّثَنَا مُعَاذُ بْنُ مُعَاذٍ، حَدَّثَنَا سُلَيْمَانُ التَّيْمِيُّ، حَدَّثَنَا أَبُو عُثْمَانَ النَّهْدِيُّ عَنْ سَلْمَانَ الْفَارِسِيِّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِنَّ لِلَّهِ مِائَةَ رَحْمَةٍ فَمِنْهَا رَحْمَةٌ بِهَا يَتَرَاحَمُ الْخَلْقُ بَيْنَهُمْ وَتِسْعَةٌ وَتِسْعُونَ لِيَوْمِ الْقِيَامَةِ " .
sunnah.com