Anas looked at the people wearing Tailsans (i.e. a special kind of head covering worn by Jews in old days). On that Anas said, "At this moment they (i.e. those people) look like the Jews of Khaibar."
Reference: Sahih al-Bukhari 4208 In-book : Book 64, Hadith 248 USC-MSA web (English) : Vol. 5, Book 59, Hadith 519 (deprecated)
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