Reference for Rosh Hashanah 13:15

ואידך מידע ידיע דשתא מעברתא בחושבנא תליא מלתא וסברי חושבנא הוא דלא סליק להו לרבנן עד האידנא

R'Ashi said, [We learn it] from here: They cast pur, that is, the lot, before Haman from day to day and from month to month to the twelfth month, which is the month Adar.<span class="x" onmousemove="('comment',' Ibid., III, 7.');">¹⁸</span> If you prefer, I can learn it from here: In the first month whic is the month Nisan.<span class="x" onmousemove="('comment',' Ibid.');">¹⁹</span>

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