Exodus 13:16
And it shall be for a token upon thine hand, and for frontlets between thine eyes: for by strength of hand the LORD brought us forth out of Egypt.
And it shall be for a token upon thine head, and for frontlets between thine eyes,.... These laws observed concerning the setting apart the firstlings of their beasts, the redemption of the firstborn of unclean ones, and of the firstborn of men, will bring the reason of it, the destruction of the firstborn of Egypt, and the preservation of the firstborn of Israel, as fresh to remembrance as any token upon the hand, put there to bring things to mind; and it will be as easily and as clearly discerned as anything upon a man's forehead may be seen by another:
for by strength of hand the LORD brought us forth out of Egypt: which is often mentioned, that it might be observed; it being the signs and wonders which the omnipotent hand of God wrought, especially the last, which worked upon Pharaoh, to let the people of Israel go; and their posterity, in all succeeding ages, would speak of this affair as if personally concerned in it, they being then in the loins of their ancestors, and represented by them, as well as they reaped and enjoyed all the benefits of that wonderful deliverance, the possession of the land of Canaan, and the blessings of it, as well as many other privileges both of a civil and religious kind. And so Maimonides {k} says,
"in every age a man is obliged to consider himself as if he in himself now went out of the bondage of Egypt, as it is said, "and he brought us forth from thence", &c.''
{k} Hilchot Chametz Umetzah, c. 7. sect. 6.