Al-Adab Al-Mufrad #1235
Animals
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا مَخْلَدُ بْنُ مَالِكٍ، قَالَ: حَدَّثَنَا هَاشِمُ بْنُ الْقَاسِمِ، عَنْ أَبِي جَعْفَرٍ الرَّازِيِّ، عَنْ لَيْثٍ، عَنْ مُجَاهِدٍ، عَنِ ابْنِ عُمَرَ، أَنَّهُ كَرِهَ أَنْ يُحَرِّشَ بَيْنَ الْبَهَائِمِ.
It is reported from Mujahid that Ibn 'Umar disliked making animals
fight each other.
About Al-Adab Al-Mufrad
This hadith is #1235 from Al-Adab Al-Mufrad, in the Book of Animals.