Commentary for Megillah 17:5

תפלין ומזוזות מ"ט משום דכתיב בהו (דברים ו, ו) והיו בהוייתן יהו מאי תרגום שכתבו מקרא איכא בשלמא תורה איכא (בראשית לא, מז) יגר שהדותא אלא הכא מאי תרגום איכא

What is the reason [why] tefillin and mezuzahs [must be written in Hebrew]? — Because in reference to them it is written, “And they shall be”, (Deuteronomy 6:6) which implies, they shall be as they originally were. What cases are there of Aramaic which can be written in Hebrew? I grant you we find in the Torah “yegar sahaduta” (Genesis 31:47); but here [in the case of tefillin, and mezuzot] what Aramaic is there?

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