Reference for Keritot 47:23

רבי יוחנן אמר

whosoever takes possession of it is its legal owner.<span class="x" onmousemove="('comment',' The ox is regarded as ownerless, for it is assumed that the owner has abandoned all his rights in it, since it is forbidden to derive therefrom any kind of benefit.');">¹⁰</span>

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