In the Second Temple period, a crimson thread was placed on the horn of the Yom Kippur scapegoat and tied to a stone in the desert before the goat was pushed off the cliff. After the verse “If your sins be as scarlet they shall be as white as snow” (Isaiah 1:18) was used as a prooftext for this non-biblical practice, the Talmud envisaged a magical ritual in which a second crimson thread would turn white on Yom Kippur to signal God’s acceptance of the people’s repentance.
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