Reference for Arakhin 39:40

דמי עלי מחוסר אומדנא ערכי עלי לא מחוסר ולא כלום:

THIS IS THE GENERAL RULE: [WHENEVER HE VOWED THE VALUATION OF] ANYTHING ON WHICH HIS LIFE DEPENDS, HE MUST PAY HIS VALUATION IN FULL.

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