Reference for Chullin 275:25

איתמר גזז ומכר ראשונה

R'Nathan B'Hoshaia says: He is exempt', because at the time that the requisite quantity has been reached one must be able to refer to [the sheep as] 'thy sheep', and this is not the case here.<span class="x" onmousemove="('comment',' For when the obligation of the first of the fleece falls due, namely with the shearing of the fifth sheep, the owner has already sold the first four sheep.');">¹⁷</span>

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