Quoting%20commentary for Megillah 59:10
חל להיות בתוך השבת מקדימין לשבת שעברה: איתמר ר"ח אדר שחל להיות בערב שבת רב אמר מקדימין ושמואל אמר מאחרין
If it falls in the middle of the week, it is read on the Shabbat before. It was stated: If Rosh Hodesh Adar falls on Friday: Rav says that [Parshat Shekalim] is read on the Shabbat before. But Shmuel says that it is read on the Shabbat after.
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