Reference for Taanit 60:10

מאי דרוש (במדבר לו, ו) זה הדבר אשר צוה ה' לבנות צלפחד וגו' דבר זה לא יהא נוהג אלא בדור זה

R'SIMEON B. GAMALIEL SAID: THERE NEVER WERE IN ISRAEL GREATER DAYS OF JOY THAN THE FIFTEENTH OF AB AND THE DAY OF ATONEMENT. I can understand the Day of Atonement, because it is a day of forgiveness and pardon and on it the second Tables of the Law were given,<span class="x" onmousemove="('comment',' [According to a tradition in Seder Olam 6, Moses spent three periods of forty days and forty nights in the Mount beginning with the seventh of Sivan and ending on the tenth of Tishri when he came down on earth with the Second Tables.]');">⁵</span>

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