Fighting for the Cause of Allah (Jihaad)
Bukhari :: Book 4 :: Volume 52 :: Hadith 60
Narrated Abdullah bin Abbas:
That Abu Sufyan told him that Heraclius said to him, "I asked you about the outcome of your battles with him (i.e. the Prophet ) and you told me that you fought each other with alternate success. So the Apostles are tested in this way but the ultimate victory is always theirs.
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