Nedarim 43 - December 7, 13 Kislev

Today’s daf is sponsored by Rochie Sommer in celebration of her 2-year anniversary starting daf yomi, "With tremendous thanks to my inspirations, my mom, Meryl Sasnowitz, and our wonderful Rabbanit Michelle." Why is it forbidden to not only borrow from but also to lend to someone one is forbidden by a vow to benefit from? If one won't lend one's cow to the other and the other vows never to use that cow to plow their field, is it only forbidden for the one who vowed, but others can do it for them? On what does it depend? The Mishna describes a number of different situations where one wants to help another in need when the needy one is forbidden by a vow to benefit from the other - in what way is one able to help in an indirect manner? In the last situation in the Mishna, two people are walking and one is in need of food. The other can put his food down, render it ownerless and the other can then take it. Rabbi Yosi disagrees and doesn't allow that. Rabbi Yochanan explains the basis for Rabbi Yosi's opinion - items that are rendered ownerless, only leave the possession of the owner when someone else picks them up, as with a gift. Rabbi Abba raises a difficulty with this, base don a braita, but he himself resolves the difficulty. Rava raises another difficulty and therefore explains Rabbi Yosi's opinion differently. He understands that the reason is due to an ordinance that rabbis instituted after a case that happened in Beit Horon that is discussed in a Mishna in Nedarim 48a. If one declares items ownerless, then can retract their declaration up to three days.