Where on the arm must the shel yad (hand tefillin) be placed?
Synopsis
The shel yad must be placed on the bicep of the left arm, specifically in the kiboret (raised fleshy area) on the bone between the elbow and armpit. A dispute exists about whether all of that bone is valid or only the lower half toward the elbow.
More in How to Put On Tefillin
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Discussion
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