A Judas sheep or Judas goat is one that is used to humans and
will bring the other sheep and goats into the yards at mustering
time.
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There is no evidence to suggest that Judas Iscariot was a Scorpio. Astrology was not prevalent in the time of Judas, and his zodiac sign is not mentioned in any historical accounts.
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The Gospel of Judas was not actually written by Judas. It is believed to have been written by a group of Gnostic Christians in the 2nd century AD. It was discovered in the 1970s and dates back to around the same time as the other gospels in the New Testament.