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.
Reference: Sahih al-Bukhari 3068 In-book : Book 56, Hadith 274 USC-MSA web (English) : Vol. 4, Book 52, Hadith 302 (deprecated)
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