Commentary for Kiddushin 51:10
ובחזקה: מנלן אמר חזקיה אמר קרא (ירמיהו מ, י) ושבו בעריכם אשר תפשתם במה תפשתם בישיבה דבי ר' ישמעאל תנא (דברים יא, לא) וירשתם אותה וישבתם בה במה ירשתם בישיבה:
and he answered it: This refers to one who sells his field because of its poor quality.<span class="x" onmousemove="('comment',' Being anxious to get rid of it, he is desirous that the deed itself shall consummate the transaction, so that the vendee may not withdraw.');"><sup>17</sup></span> R'Ashi said: He really wished to present it to him as a gift; why then did he indite it with the phraseology of purchase? In order to strengthen his rights therein.<span class="x" onmousemove="('comment',' Should the donor's creditors seize it for debt, the recipient would be able to claim its value, as stated in the deed, from him. Hence it is literally meant: it is both sold and gifted.');"><sup>18</sup></span>
Daf Shevui to Kiddushin
I want to emphasize that acquisition by “hazakah” does not mean I can take your land just by squatting on it. Elsewhere we learn that to possess land by hazakah one must also claim that he bought it but lost the documentation. Hazakah creates a presumption of ownership. If you live on land for three years and I do not protest, I cannot come later and say that the land is mine. And if I sell you land, and you go and dwell on it, its yours even if you have not yet paid for it. But no one thinks that you can buy land by simply dwelling on it.