For the source text click/tap here: Nedarim 25
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One of the things that the Sages demanded of someone taking an oath is that they must mean what they say. The person is told that his statement must conform to the simple meaning of the words that he says without any secret meanings or intentions.
Even though one might be telling the truth when he takes an oath, his oath must hold the same meaning to others - the court, the witnesses - that it holds for himself. But don't people always make oaths according to their own understandings? The rabbis go on to discuss the difficulty of defining what people hold in their hearts. They find proof texts in the Torah that suggest that Moses helped us to understand this very point.
The Gemora asks: Let Moses make them swear to fulfill the Torah? The Gemora answers: This implies one Torah (and Moshe wanted them to fulfill the Written Torah and the Oral Torah).
We explore the oaths Moses enjoined Am Yisrael to keep both the Oral and Written law, and how the oath at Sinai superseded subsequent later oaths.