Abu Hurairah reported,

I heard the Messenger of Allah ﷺ say, "Allah has made mercy into one hundred parts. He kept ninety-nine with Him and sent down one part to the earth. From that single part, all creatures show mercy to one another, so much so that a mare lifts her hoof away from her foal out of fear of harming it."

Azami 11395

Sahih

عن أبي هريرة قال

سمعت رسول الله ﷺ يقول: جعل الله الرحمة مائة جزء. فأمسك عنده تسعة وتسعين، وأنزل في الأرض جزءا واحدا، فمن ذلك الجزء تتراحم الخلائق حتى ترفع الدابة حافرها عن ولدها خشية أن تصيبه.

الأعظمي 11395صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Repentance and seeking forgiveness
Chapter
Comprehensive and general supplications
Section
Vastness of the mercy of Allah and that it precedes His wrath
Numbering
Jami al-Kamil 11395 (2nd edition)
Azami 11395