Zugot

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Found on http://en.wikipedia.org/wiki/Zugot

zugot

(from the article `Talmud and Midrash`) At the beginning of the 2nd century , a judicial body headed by the zugot—pairs of scholars—assumed Halakhic authority. There were five pairs in all, ... Ancient Halakha knew no controversy. The earliest controversy dates to the pre-tannaitic zugot. Hillel and Shammai differed on signifi...
Found on http://www.britannica.com/eb/a-z/z/11
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