Speak of the devil - Wikipedia
https://en.wikipedia.org:443/wiki/Speak_of_the_devil
WEBThe phrase may be traced back to the 16th century and for a long time it implied the prohibition of mentioning the devil. In the modern times it has lost its sinister meaning. In many cultures a different, dangerous, person or character is referenced in the phrase. In Serbian, the phrase translates to, "Speak of the wolf and he is at your door."
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