Al-Adab Al-Mufrad #383
Mercy
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا مَحْمُودٌ، قَالَ: حَدَّثَنَا يَزِيدُ، قَالَ: أَخْبَرَنَا الْوَلِيدُ بْنُ جَمِيلٍ الْكِنْدِيُّ، عَنِ الْقَاسِمِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ أَبِي أُمَامَةَ قَالَ: قَالَ رَسُولُ اللهِ صلى الله عليه وسلم: مَنْ رَحِمَ وَلَوْ ذَبِيحَةً، رَحِمَهُ اللَّهُ يَوْمَ الْقِيَامَةِ.
Abu Umama that the Messenger of Allah, may Allah bless him and
grant him peace, said, "Anyone who shows mercy, even to an animal meant
for slaughtering, will be shown mercy by Allah on the Day of Rising."
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About Al-Adab Al-Mufrad
This hadith is #383 from Al-Adab Al-Mufrad, in the Book of Mercy.