Reference for Zevachim 212:14

אמר רבא אי קשיא לי הא קשיא לי הא דתנן פסח ומילה מצות עשה

[because,] As for shebi'ith, that is because it imposes its own status upon the money received for it.<span class="x" onmousemove="('comment',' Lit., 'it seizes its money.' - If shebi'ith is sold, the money is forbidden in the same way as itself. That does not apply to heleb, however.');">¹⁷</span> [Nor] from terumah, [because,] As for terumah, that is because it is never exceptionally permitted.<span class="x" onmousemove="('comment',' Lit., 'it is not permitted out of its general (interdict) .' Terumah is always forbidden to unclean priests, whereas some heleb is permitted, viz., the heleb of a hayyah (non-domesticated animal, e.g.. deer) .');">¹⁸</span>

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