Mesorat%20hashas for Megillah 60:1

ואיזו היא שבת רביעית כל שחל ר"ח ניסן להיות בתוכה ואפילו בע"ש:

Which is the fourth Shabbat?The one immediately preceding the week in which Rosh Hodesh Nisan falls, even if on Friday.

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