Nafi' narrates from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) held a horse race, setting the course for the conditioned horses from al-Hafya' to Thaniyyat al-Wada', and fixing the course for the unconditioned horses from al-Thaniyyah to the mosque of Banu Zurayq. Sayyiduna Ibn Umar (may Allah be pleased with them both) said: I came in first, and the horse carried me on past the mosque.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السبق والرمي / 19767