Sunan Abi Dawud Book 15, Hadith 98
The Prophet (ﷺ) said: Wagers are allowed only for racing camels, or horses or shooting arrows.
My foster-father said to me - he was one of Banu Murrah ibn Awf, and he was present in that battle, the battle of Mu'tah: By Allah, as if I am seeing Ja'far who jumped from his reddish horse and hamstrung it; he then fought with the people until he was killed.
Abu Dawud said: The tradition is not strong.
‘Abd Allah bin Umar said “The Apostle of Allaah(ﷺ) held race between the horses which had been made lean by training from Al Hafya’. The goal was Thaniyyat Al Wada’ and he held a race between the horses Banu Zuraiq and ‘Abd Allaah was one of the racers.