Ibn ‘Umar said “The Apostle of Allaah(ﷺ) allotted three portions for a man and his horse, one for him and two for his horse.
Sunan Abi Dawud Book 15, Hadith 257
← Previous Hadith A’ishah said (this is the version of narrator Yahya). A man from the polytheists accompanied the Prophet (ﷺ) to fight along with him. He said “Go back. Both the narrators (Musaddad and Yahya) then agreed. The Prophet said “We do not want any help from a polytheist.”

Sunan Abi Dawud Book 15, Hadith 256 Next Hadith → We four persons, came to the Messenger of Allah (ﷺ), and we (i.e. each one of us) had horses. He therefore, allotted one portion for each of us, and two portions for his horse.

Sunan Abi Dawud Book 15, Hadith 258