Related for Rosh Hashanah 38:13
העיד ר' יהושע בן לוי משום קהלא קדישא דירושלים על שני אדרים שמקדשין אותם ביום עיבוריהן
as it has been taught: 'How long is the period of the prolongation of the year? Thirty days.
Tosefta Rosh Hashanah (Lieberman)
The ambassadors set out for six months. R. [Judah the Prince] ordered that they also will be sent for the Second Adar because of Purim.
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