Relating to the Assidaeans, an ancient Jewish sect devoted to strict religious observance and study of the Law.
From Hebrew Hasidim ('pious ones') + -ean suffix. The Assidaeans were a real sect in Judea during the Maccabean period, around 160 BCE.
The Assidaeans were the ancient ancestors of concepts like ultra-Orthodox Judaism—they were so devoted to religious law that they essentially invented the idea of separating themselves from secular society.
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