That he was riding a horse on the day, the Muslims fought (against the Byzantines), and the commander of the Muslim army was Khalid bin Al-Walid who had been appointed by Abu Bakr. The enemy took the horse away, and when the enemy was defeated, Khalid returned the horse to him.
Sahih al-Bukhari Book 56, Hadith 274
← Previous Hadith Once a slave of Ibn `Umar fled and joined the Byzantine. Khalid bin Al-Walid got him back and returned him to `Abdullah (bin `Umar). Once a horse of Ibn `Umar also ran away and followed the Byzantines, and he (i.e. Khalid) got it back and returned it to `Abdullah.

Sahih al-Bukhari Book 56, Hadith 273 Next Hadith → I said, "O Allah's Messenger (ﷺ)! We have slaughtered a young sheep of ours and have ground one Sa of barley. So, I invite you along with some persons." So, the Prophet (ﷺ) said in a loud voice, "O the people of the Trench! Jabir had prepared "Sur" so come along."

Sahih al-Bukhari Book 56, Hadith 275