Today's daf is sponsored by Mark Goldstein in honor of Rena Septee Goldstein's birthday! "Happy birthday to my wonderful wife and daf partner!" After three years of uncontested use of land or property, a possessor's claim of purchase or gift is sufficient to prove ownership without documentation (chazaka). For non-irrigated fields, partial use in the first and last years suffices. A tannaitic debate discusses the required duration. Concerning fields with trees, Rabbi Yishmael is lenient and requires only three harvests of different fruits, even within one year. The three-year rule's origins are debated. Rabbi Yochanan, citing Usha rabbis, derives it from shor muad (an ox established as dangerous after three gorings). However, the Gemara raises and resolves several objections to the shor muad comparison, though the final resolution aligns only with Rabbi Yishmael's position in the Mishna. Therefore Rav Yosef brings an explanation for the rabbis who disagree with Rabbi Yishmael from Yirmiyahu