The Book of Repentance
Ṣaḥīḥ Muslim 6974
إِنَّ لِلَّهِ مِائَةَ رَحْمَةٍ أَنْزَلَ مِنْهَا رَحْمَةً وَاحِدَةً بَيْنَ الْجِنِّ وَالإِنْسِ وَالْبَهَائِمِ وَالْهَوَامِّ فَبِهَا يَتَعَاطَفُونَ وَبِهَا يَتَرَاحَمُونَ وَبِهَا تَعْطِفُ الْوَحْشُ عَلَى وَلَدِهَا وَأَخَّرَ اللَّهُ تِسْعًا وَتِسْعِينَ رَحْمَةً يَرْحَمُ بِهَا عِبَادَهُ يَوْمَ الْقِيَامَةِ
inna lillāh māʾaha raḥmatin anzala minhā raḥmatan wāḥidatan bayna al-jinni wa-l-insi wa-l-bahāʾimi wa-l-hawāmmi fabihā yataʿāṭafūna wabihā yatarāḥamūna wabihā taʿṭifu al-waḥshu ʿalā waladihā wa-akhara-Llāh tisʿan watisʿīna raḥmatan yarḥamu bihā ʿibādah yawma al-qiyāmah
Transliteration generated from the Arabic vowel marks
The full narration
Abu Huraira reported Allah's Messenger (ﷺ) as saying:There are one hundred (parts of) mercy for Allah and He has sent down out of these one part of mercy upon the jinn and human beings and animals and the insects, and it is because of this (one part) that they love one another, show kindness to one another and even the beast treats its young one with affection, and Allah has reserved ninety nine parts of mercy with which He would treat His servants on the Day of Resurrection
Source
Ṣaḥīḥ Muslim · 6974