It is reported by Muslim that: Messenger of Allah (ﷺ) said, “Allah created one hundred units of mercy on the Day He created the heavens and the earth. Each one of them can contain all that is between the heaven and the earth. Of them, he put one on earth, through which a mother has compassion for her children and animals and birds have compassion for one another. On the Day of Resurrection, He will perfect and complete His Mercy”. (That is He will use all the hundred units of mercy for his slaves on that Day).
The above is just a translation for the meaning in English, and in the following is the speech (Hadith) in Arabic:
“إن الله تعالى خلق يوم خلق السماوات والأرض مائة رحمة كل رحمة طباق ما بين السماء إلى الأرض، فجعل منها في الأرض رحمة، فيها تعطف الوالدة على ولدها، والوحش والطير بعضها على بعض، فإذا كان يوم القيامة، أكملها بهذه الرحمة”.