Narrated Abu Huraira (radi Allahu anhu):

I heard Allah's Apostle (sal Allahu alaihi wa sallam) saying. 'Allah divided Mercy into one-hundred parts and kept ninety-nine parts of it with Him and sent down one part on earth. And because of that, its one single part, His creations are Merciful to each other, so much so that an animal lifts its hoof away from its young lest it should hurt it.