Upon thy hand, between thine eyes Proverbial expressions, denoting that these things were never to be out of their minds. The Jews, however, understood this literally, and hence the use of phylacteries among them, pieces of parchment inscribed with sentences of their law, which they bound upon their left hand, and placed upon their foreheads between their eyes.
Related Commentaries of Exodus 13:9
Exodus 13:9
9 And it shall be for a sign unto thee upon thine hand, and for a memorial between thine eyes, that the LORD'S law may be in thy mouth: for with a strong hand hath the LORD brought thee out of Egypt.