it shall be for a sign unto thee upon thine hand, etc. - There is no reason to believe that the Oriental tattooing - the custom of staining the hands with the powder of Hennah, as Eastern females now do - is here referred to. Nor is it probable that either this practice or the phylacteries of the Pharisees - parchment scrolls, which were worn on their wrists and foreheads - had so early an existence. The words are to be considered only as a figurative mode of expression.
that the Lord’s law may be in thy mouth, etc. - that is, that it may be the subject of frequent conversation and familiar knowledge among the people.