(4) باب فِي سَعَةِ رَحْمَةِ اللَّهِ تَعَالَى وَأَنَّهَا سَبَقَتْ غَضَبَهُ
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.
Reference: Sahih Muslim 2752 c
In-book reference: Book 50, Hadith 22
USC-MSA web (English) reference(deprecated numbering scheme): Book 37, Hadith 6631