More Discussions for this daf
1. Is a Niduy a Neder? 2. Mushba ve'omed 3. Relationship of Mitzvos and Nedarim
DAF DISCUSSIONS - NEDARIM 8

Gershon Dubin asked:

Dear Rabbi Kornfeld,

From where do we know that ein shevuah chala al shevuah, or the rule of "mushba ve'omed"?

The Kollel replies:

The Gemara in Shevuos (25-27) learns this from the Pasuk, "l'Hara O leHeitiv" (Vayikra 5).