talk of the devil, and he is bound to appear

talk of the devil, and he is bound to appear

An acknowledgment of a person who has arrived just as or after they were being discussed. John: "Hey everyone, sorry I'm late!" Dave: "Well, talk of the devil, and he is bound to appear! We were just chatting about something funny you said the other day."
See also: and, appear, bound, he, of, talk