Reference for Ketubot 6:8

אמר רבא דאמרי שר צבא בא לעיר ה"ד אי דאתי וחליף ליעכב לא צריכא דאתי וקבע בג' מיהא לכנוס אספרווא דידיה בג' קאתו

Rava said: They say: “A general has come to town.” What is the case? If he comes and passes by, let it be delayed. It is not necessary [to state this but] that he came and stayed. Let him, [then], marry on the third day [of the week]! His vanguard arrived on the third day.

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