Fighting for the Cause of Allah (Jihaad)
Bukhari :: Book 4 :: Volume 52 :: Hadith 302
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.
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