Commentary for Nedarim 86:4
שני לא קנה
It was taught: If one declares his field hefker: he can retract within the first three days, but not after.<span class="x" onmousemove="('comment',' This is in reference to the tithe. No tithe was due on produce taken from ownerless fields. Now, if he either revokes his declaration within the first three days, or takes possession without a formal retraction, his declaration is null: consequently, it has never been ownerless, and the crops must be tithed. But after three days, the declaration has legal force. Naturally, if no one else takes possession thereof, he can do so himself, but whether he or another, it is free from tithe. ');"><sup>3</sup></span>
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