Reference for Megillah 59:12

תנן חל להיות בתוך השבת מקדימין לשעבר ומפסיקין לשבת אחרת מאי לאו אפילו בע"ש לא בתוך השבת דוקא

It was taught: If it falls during the week, they move it [Parshat Shekalim] up to the previous Shabbat, and they stop [the order of special Shabbatot] for the following Shabbat. Does not this rule apply even where it falls on Friday? No; only if it falls actually in the middle part of the week.

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