Reference for Bava Kamma 228:10

אי אמרת בשלמא גנב כגזלן דר"ש קאמר משום הכי קני אלא אי אמרת גנב כגזלן דרבנן הא מני

in which case ownership is transferred; the ruling in the Mishnah would then be in accordance with Rabbi, as on this account ownership would be transferred. But if you say that he meant [to make him subject] to the law of robber as defined by the Rabbis,<span class="x" onmousemove="('comment',' Who hold that there is no Renunciation in the case of a robber. ');">³</span>

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