Reference for Bava Batra 87:2
משום דקא בעי למיתנא סיפא מכר לו פרה מכר לו טלית דדוקא מכר דהוה ליה יאוש ושינוי רשות אבל לא מכר דהדרא ליה לא תנא רישא נמי מכר
why should the rule not be stated in reference to the robber himself?<span class="x" onmousemove="('comment',' I.e., that Simeon must not testify to the title of Reuben himself if it is challenged by a third party. The rule in fact should be stated thus: If a man wrongfully seizes a house or a field, the original owner must not testify on his behalf because the thief is responsible to him for it. ');"><sup>2</sup></span>
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