Exodus 13:9

And this miracle shall be inscribed and set forth upon the tephilla of the hand, on the top of thy left (arm,) and for a memorial inscribed and set forth upon the tephilla of thy head, set between thine eyes on thy forehead; that the law of the Lord may be in thy mouth, because in strength, with a mighty hand, the Lord brought thee forth from Mizraim.

“And this shall serve you”—There are those who dispute our holy ancestors, and say that “being a sign and a reminder” has the same meaning as: “For they are a graceful wreath upon your head, a necklace about your throat” (Proverbs 1:9). [They] also [suggest] that “tie them as a sign upon your arm” has the same meaning as: “Bind them upon the tablet of your heart always” (Proverbs 6:9). [They] similarly [understand] “write them on the doorposts of your house” as the same in meaning to “Write them on the tablet of your heart” (Proverbs 3:3). In that case, what would “a sign” and “a reminder” mean? That it will be flowing in your mouth, “For with a strong arm God brought you out of Egypt.” However, this is an incorrect approach. For at the beginning of the book [of Proverbs] it states “The Proverbs of Solomon.” Therefore, [the readers should expect] that everything mentioned in the book is a proverb [not literal]. However, the Torah is not a book of proverbs—God forbid!—so that this verse must retain its literal meaning, and we will not remove it from its peshat. For its literal meaning doesn’t contradict any logical principle, as is the case for “and you shall circumcise your hearts” (Deuteronomy 10:16), the understanding of which needs to be adjusted…

AND IT SHALL BE FOR A SIGN UNTO THEE UPON THY HAND, AND FOR A MEMORIAL BETWEEN THINE EYES, THAT THE LAW OF THE ETERNAL MAY BE IN THY MOUTH; FOR WITH A STRONG HAND HATH THE ETERNAL BROUGHT THEE OUT OF EGYPT. To be interpreted [properly, the verse must be transposed]: “And it shall be for a sign unto thee upon thy hand and for a memorial between thine eyes, that with a strong hand hath the Eternal brought thee out of Egypt, that the law of the Eternal may be in thy mouth.” The meaning thereof is that you are to inscribe the exodus from Egypt [in the phylacteries] upon your hand and between your eyes, and remember it always in order that G-d’s law be in your mouth, [so that you will] observe His commandments and teachings, for He is your Master Who redeemed thee out of the house of bondage.

לאות על ידך, according to the true meaning: an exhortation that this memory should be with you permanently, as if the subject matter had literally been inscribed on your hand. We find a similar syntax in Song of Songs 8,6 שימי כחותם על לבך, “place it on your heart as if it had been engraved there like a seal,”

בין עיניך, like a precious jewel which one places on one’s forehead as a decoration.

כי ביד חזקה הוציאך, by changing the rules governing the inert, eternal components of nature. This point was spelled out in Joshua 4,24 when he referred to G’d having split the waters of the Jordan to enable the people to wade across. The verse there reads: “so that all the nations of the earth will know that the hand of the Lord is very powerful.”