Today's daf is sponsored by Phyllis Hecht. "Mizmor l’todah- אוֹדְךָ ה’ אלקי בְּכָל לְבָבִי וַאֲכַבְּדָה שִׁמְךָ לְעוֹלָם to my fabulous co-Chashmonaim Daffers, to my remarkable Hadran virtual chevrutas, to my mentor-one of a kind-Rabbanit Michelle. Thank you all from the bottom of my heart for all you have done for me over the past year. One year ago today was the first day of the rest of my life - I survived a critical surgery after a life-threatening diagnosis, which resulted from a miraculous car accident. Words are insufficient for the hakarat hatov to Hakadosh Baruch Hu. You have all been there for me in a myriad of ways by continuously davening, messaging and more. Our daily limudim on- and off-line continuously fill me with hope and strength. May Hashem allow me to celebrate this date yearly ad meah viesrim shana. May we continue together מדף לדף ומחיל לחיל. May we all merit to share in many bsorot tovot!" There are differences of opinion regarding which vows can or cannot be nullified by a chacham to cancel the vow. The takana of having witnesses sign on the get is explained both according to Rabbi Elazar (who claims that according to the Torah there is no need for witnesses to sign the get) and according to Rabbi Meir (who claims that from the Torah you need witnesses to sign on the get). Pruzbol was instituted so that loan would not be canceled in the shmita year. How can the rabbis make a takana to go against a Torah law? Two explanations are given. According to one explanantion, shmita is only rabbinic as by Torah law there is no shmitat kesafim and it was instituted by the rabbis so people would remember that there is such a Torah law. How can the rabbis institute something like that if it goes against Torah law, as by Torah law, when there is no shmita, the money should be returned to the creditor? There are two answers to this question. Did Hillel institute prozbul for his generation only or for all future generations? Later Rabbis had different reactions to pruzbol about whether or not it was a positive development.