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Which Jewish group joined Mattathias and his sons in the hills?
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The Jewish group that joined Mattathias and his sons in the hills was the Hasideans.
They were a pious and strict group deeply committed to the Law of Moses. Initially, the Hasideans refused to fight on the Sabbath, which resulted in significant casualties; however, Mattathias subsequently insisted that all resistance groups must fight on the holy Sabbath if required.1