Hadithcore
Hadith #2115880

Abu Dawud also reported, ‘He allotted three shares for a man and his horse, two for his horse and one for him.’

وَلِأَبِي دَاوُدَ: { أَسْهَمَ لِرَجُلٍ وَلِفَرَسِهِ ثَلَاثَةَ أَسْهُمٍ: سَهْمَيْنِ لِفَرَسِهِ, وَسَهْماً لَهُ } [1]‏ .‏

References2 variants
Sunnah.com reference
Book 11, Hadith 34
Arabic/English book reference
Book 11, Hadith 1330