It wasnarrated from Abu Sa'eed that the Messenger of Allah (ﷺ)said:
"On the day when He created the heavens and the earth, Allahcreated one hundred (degrees of) mercy, of which He placed one onearth, by virtue of which mothers show compassion to their childrenand animals as well as the birds show compassion to one another. AndHe kept back ninety-nine (degrees of) mercy. When the Day ofResurrection comes, Allah will complete this mercy."
English reference: Vol. 5, Book 37, Hadith 4294
Arabic reference: Book 37, Hadith 4435