Midrash for Chullin 264:19

אזל ר' טבלא קמיה דרב נחמן א"ל

When R'Aha B'Hanina came from the schools in the South he reported that R'Joshua B'Levi and the elders of the South ruled that a priest who became a slaughterer was exempt from giving the dues for the first two or three weeks,<span class="x" onmousemove="('comment',' I.e., for so long until he is established in the town as a butcher.');">⁹</span>

Sifrei Devarim