eighth day This is Shemini Atzereth. See next comment.
time of retreat Atzereth in Hebrew. It is a time when one must 'hold back' from doing work (Saadia; Ibn Ezra; Radak, Sherashim) and maintain a level of holiness (Sforno). Others say it is a 'holdover' for the holiday (Rashi; Ibn Ezra).
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