Peah 3:6-7

Peah 3:6

Rabbi Eliezer says that land suitable for planting a quarter-kav of grain is liable in peah. (This is about 235 square feet.) Rabbi Yehoshua says it has to be land that can yield 12 kav of produce (about 6.25 gallons). Rabbi Tarfon says an area six tefachs by six tefachs (a tefach is about 3.5 inches, so this would be an area of about three square feet). Rabbi Yehuda ben Beseira says an area large enough to reap twice; this is the halacha. Rabbi Akiva says that any sized piece of land is liable in peah and first fruits. Not only that, but one can write a prozbul (to collect debts in the sabbatical year) using land of any size, and use it to purchase unsecured property using cash, a document or a legal presumption. (These are means of acquiring real estate; one may purchase moveable goods with these methods if they are sold in conjunction with the land.)

Peah 3:7

If a dying person gives away his land and he keeps any of it at all for himself, the gift is valid. (Therefore, if he recovers, he cannot retract it.) If he kept no land for himself, the gift is invalid (and if he recovers, he may retract it). If he divided his land among his sons in writing and also gave his wife a share, her acceptance of it is in lieu of the value of her kesubah. Rabbi Yossi says this is so even if he did not assign her a share, just if she agreed to partner with the sons.