Today's daf is sponsored for a refuah shleima for Shmuel Henoch Yaakov Ben Chiyena.

Rav Nachman instituted a shevuat heiset, a rabbinic oath, for defendants who completely denied a claim. There is debate about the exact circumstances under which Rav Nachman required this oath.

What distinguishes a Torah-mandated oath from a rabbinically instituted one (heiset)? The Gemara presents three possible differences.

Under what circumstances can a creditor demand that a debtor repay money in front of witnesses, such that without witnesses, the debtor's claim of having already repaid becomes invalid? The Gemara quotes two different versions of Rav Asi's position, as well as two different versions of Shmuel's response to Rav Asi. Their opinions are then questioned and explained in light of our Mishna.

The Gemara presents four actual cases involving disputes between creditors and debtors, explaining how each case was ruled. In some instances, Abaye and Rava disagreed about the proper ruling.