Reference for Bava Batra 96:1

בשדה סתם אבל בשדה זו לא

if he is forced to sell 'a' field,<span class="x" onmousemove="('comment',' I.e., if he is called upon merely to sell one of his fields, and is allowed to choose which, because in that case we can say that the sale is not unwelcome to him. ');">¹</span> but if he is forced to sell 'this'<span class="x" onmousemove="('comment',' I.e., one which his torturers specify, and which perhaps he particularly wished to keep for himself. ');">²</span>

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