Reference for Bava Batra 274:7

אמר רב הונא בריה דרב יהושע משום דאתו ממולאי אמריתו מילי מוליאתא אפילו רשב"ג לא קאמר אלא לאחר אבל לעצמו לא

but if not, he has not acquitted himself of his ritual duty.<span class="x" onmousemove="('comment',' Since an ethrog cannot be used for its ritual purpose unless it is in the exclusive possession of him who uses it, the ethrog of the inherited estate cannot be regarded as being in the undisputed possession of one of the brother unless it is known that the others do not object to his complete consumption of it. ');">¹³</span> This, however, only in the case where an ethrog is available for everyone [of the brothers].<span class="x" onmousemove="('comment',' Some edd., 'but not a quince or a pomegranate'. ');">¹⁴</span>

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