Commentary for Ketubot 91:2

מאי טעמא גזירה חצי ערכו אטו ערך חציו וערך חציו הוי ליה אבר שהנשמה תלויה בו

What is the reason? It is a preventive measure against the possibility [of a vow for] the value of half of one’s body, and the value of a half is like an organ that life depends on.

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