Abu Sufyan said, "Heraclius sent for me when I was in 'llya' (i.e. Jerusalem). Then he asked for the letter of Allah's Messenger (ﷺ) and when he had finished its reading there was a great hue and cry around him and the voices grew louder and we were asked to quit the place. When we were turned out, I said to my companions, 'The cause of Ibn Abi Kabsha has become conspicuous as the King of Bani Al- Asfar is afraid of him.' "
Reference: Sahih al-Bukhari 2978 In-book : Book 56, Hadith 187 USC-MSA web (English) : Vol. 4, Book 52, Hadith 221 (deprecated)
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