It was narrated from Abu Sa’eed that the Messenger of Allah (ﷺ) said:“On the day when He created the heavens and the earth, Allah created one hundred (degrees of) mercy, of which He placed one on earth, by virtue of which mothers show compassion to their children and animals as well as the birds show compassion to one another. And He kept back ninety-nine (degrees of) mercy. When the Day of Resurrection comes, Allah will complete this mercy.”

English translation · Sunan Ibn Majah