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 (ﷺ) ) 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.
Reference: Sahih al-Bukhari 2804 In-book : Book 56, Hadith 21 USC-MSA web (English) : Vol. 4, Book 52, Hadith 60 (deprecated)
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