Sahih Muslim | Book 37 | Hadith Number 6631

Narrated by Abu Huraira
Abu Huraira reported Allah's Messenger (may peace be upon him) 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 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.