Reference for Bekhorot 101:25

(במדבר יח, טז) ופדויו מבן חדש תפדה ריבה

NOR WITH IMMOVABLE PROPERTIES, NOR WITH OBJECTS OF HEKDESH.<span class="x" onmousemove="('comment',' V. Glos. Explained later in the Gemara as meaning that hekdesh has the same rule, i.e., that it cannot be redeemed with slaves, etc.');">¹⁹</span>

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