Related 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.');"><sup>18</sup></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.');"><sup>19</sup></span>
Tosefta Rosh Hashanah (Lieberman)
[The month] Nisan is the beginning of the year for the kings, pilgrimage festivals, months, and the collection of the temple tax. Some say: Also for renting houses. How [one should understand]: "for the kings"? [Answer:] If he dies in Adar and another takes his place in Adar, the year is counted both for him and for the other. If he dies in Nisan and another takes his place in Nisan, the year is counted both for him and for the other. If [one] dies in Adar and another takes his place in Nisan, the first [year] is counted for the first and the second [year] for the second.
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Tosefta Shekalim (Lieberman)
All the congregational sacrifices are offered on the first of Nisan. And when the new moon comes in time, one sacrifice from the New, and if not, one sacrifice from the old. And if one offered [Pinge] for oneself, they were [as an offering] valid; only on the condition that they had to be handed over to the public.
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