Explanation
Allah, Blessed and Exalted, created mercy of one hundred parts. He sent one mercy down to this world and withheld ninety-nine parts for the Day of Judgment. Because of this single mercy, all of the creatures from among the humans, Jinn, animals, and insects, are merciful to one another. Even the horse that is known for its swiftness lifts its hoof away from its youngster lest it should hurt it. Because of this mercy, beasts are kind to their youngsters. Allah, Blessed and Exalted be He, has retained ninety-nine mercies to have mercy upon His slaves on the Day of Judgment.
Second Hadīth: Allah, Blessed and Exalted, created one hundred mercies on the Day He created the heavens and the earth. Each mercy can fill the distance that is between the heavens and the earth. He placed one of them on earth, through which a mother has compassion for her child and animals and birds have compassion for one another. Then, on the Day of Judgment, Allah, the Lord of the worlds, will complete it with the ninety-nine mercies. So if all the great blessings of Allah, the Almighty, that He bestows on man in this world, which is basically built on anguish, are caused by one mercy, how then would the effect of one hundred mercies be in the Hereafter, which is the abode of eternity and recompense?!