Tikvah
Editors’ Pick

August 6, 2025

Talmudic Law Comes to Terms with Modern Prosthetics

The bionic Jew.

Tradition requires that phylacteries be wrapped around the nondominant arm—but does wrapping them around a prosthetic arm count, legally, as fulfilling the commandment? And if the arm doing the wrapping is prosthetic, can the person to whom it belongs really be considered to be performing the mitzvah himself? What about a kohen (a member of the priestly caste), who normally wouldn’t join in the ritual blessing of the congregation—which requires that arms be extended and fingers held in a particular formation—if missing a limb? Does a modern prosthesis, with its technological wizardry, change that? Dvir Amar reports on one rabbinic authority’s recent ruling:

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