Commentary for Bava Batra 55:1
מתני׳ <big><strong>חזקת</strong></big> הבתים והבורות והשיחין והמערות והשובכות והמרחצאות ובית הבדין ובית השלחין והעבדים וכל שהוא עושה פירות תדיר חזקתן שלש שנים מיום ליום
<b><i>MISHNAH</i></b>. A PRESUMPTIVE TITLE<span class="x" onmousemove="('comment',' Heb. hazakah, [H], which combines the meanings of 'holding' or 'occupation', and 'presumed ownership'. What is meant is a title not supported by documents or witnesses, but based on the mere fact of possession. The English legal term Is usucaption'. ');"><sup>1</sup></span> TO HOUSES, PITS, DITCHES AND CAVES, DOVECOTES, BATHS, OLIVE PRESSES, IRRIGATED FIELDS, SLAVES, AND ANYTHING WHICH IS CONTINUALLY PRODUCING<span class="x" onmousemove="('comment',' Lit., 'yielding fruits'. ');"><sup>2</sup></span> IS CONFERRED BY THREE YEARS [UNCHALLENGED POSSESSION]<span class="x" onmousemove="('comment',' As will be seen later, such possession creates a presumption of ownership only if the possessor pleads at the same time that he came by the object in a lawful manner, e.g., by purchase or gift. If he does not advance this plea, the fact of his years' possession has no legal value. ');"><sup>3</sup></span>