For the source text click/tap here: Bava Metzia 20
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The mishna teaches: If there are cancellations of contracts [simponot] among one’s documents, he should do what is stated in the simponot. The Gemara cites that which Rav Yirmeya bar Abba says that Rav says: With regard to a simpon that emerges from the possession of a creditor, even if it is written in his own handwriting and is clearly not forged, it is considered as though he were merely jesting and the simpon is invalid.
The Gemara explains: It is not necessary to state this halakha in a case where it is written in the handwriting of a scribe, as it can be said that he happened to have an opportunity to have the scribe write the simpon, and therefore he had him write it before the debt was repaid.
We examine the etymology of the Greek loan word Συμφωνία and its transformation into the modern understanding of both harmonic musicality and contracts.