The Messenger of Allah, peace and blessings be upon him, said, “Verily, on the day Allah created the heavens and earth, he created one hundred parts of mercy. Each part can fill what is between the heaven and earth. He made one part of mercy for the earth, from it a mother has compassion for her child, animals and birds have compassion for each other. On the Day of Resurrection, he will perfect this mercy.”(Ṣaḥīḥ Muslim)