Related for Gittin 72:4
רבי אליעזר אמר מהכא (יהושע יט, נא) אלה הנחלות אשר נחלו אלעזר הכהן ויהושע בן נון וראשי האבות וגו' וכי מה ענין ראשים אצל אבות לומר לך מה אבות מנחילין את בניהם כל מה שירצו אף ראשים מנחילין העם כל מה שירצו
Raba, however, replied: The Rabbis have power to expropriate [for the benefit of the public]<span class="x" onmousemove="('comment',' Lit., '(Anything declared) hefker (ownerless) by the Beth din is hefker'. ');"><sup>4</sup></span>
Tosefta Shekalim (Lieberman)
On the 15th of this [month] the officials of the court go out and declare the mixed crops as ownerless, For what the court has declared as ownerless is considered ownerless and is exempt from the tithes. If [a] man found mixed crops in a vineyard, it is lawful as "robbery" and free from tithes; but is in the field it is forbidden as "robbery" and he is obliged to pay tithes.
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