Commentary for Rosh Hashanah 62:14
ועדיין היו מציצין ורואין הלבין היו שמחין לא הלבין היו עצבין התקינו שיהו קושרין אותו חציו בסלע וחציו בין קרניו של שעיר המשתלח
and if it did not turn white they were sad. They therefore made a rule that it should be fastened to the door of the court on the inside. People, however, still peeped in and saw, and if it turned white they rejoiced and if it did not turn white they were sad.
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