German

wenn man vom Teufel spricht, dann kommt er

proverb[vɛn man fɔm ˈtɔɪ̯fl̩ ʃpʁɪçt dan kɔmt eːɐ̯]

speak of the devil

wenn man vom Teufel spricht, dann kommt er is a German proverb meaning “speak of the devil”.

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Meanings and forms from Wiktionary (CC BY-SA 4.0); example sentences from Tatoeba (CC BY 2.0 FR).