The Shabbat before a week in which Rosh Chodesh falls is called Shabbat Mevarchim (שבת מברכים) and the blessing on the new month, Birkat ha-Chodesh (ברכת החודש), is said. It is distinct from Shabbat Rosh Chodesh, Shabbat Machar Chodesh, and Shabbat ha-Chodesh.
Shabbat Mevarchim
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