Reference for Bekhorot 7:19

לויה לא תיפקע

Said R'Safra to Abaye: According to your interpretation, which is that [the a fortiori argument] also refers to their [the Levites'] animals,<span class="x" onmousemove="('comment',' Inferring that the firstling of an ass belonging to a Levite and Priest is also exempt a fortiori.');">¹¹</span>

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