Reference for Arakhin 39:46

הא אמרה חדא זימנא דא"ר גידל א"ר

What is the reason? - [It means,] We are stringent about the vow, 'Half of my valuation' because [of its possible confusion with] 'The valuation of one half of him', and the valuation of the half of oneself is tantamount to [the valuation of] something on which one's life depends.

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