Reference for Zevachim 120:6

משום דאיכא למיפרך מה להצד השוה שבהן שכן יש בהן צד מזבח

and the firstlings of your herd and of your flock:<span class="x" onmousemove="('comment',' Deut. XII, 6.');">⁸</span> this assimilates tithe to firstling: as [the law of] firstling is valid only whilst the Temple stands, so is tithe va only whilst the Temple stands.

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