It shall serve as a sign to you on your hand (arm), and as a reminder on your forehead, so that the instruction (law) of the Lord may be in your mouth; for with a strong and powerful hand the Lord brought you out of Egypt.

The blood shall be a sign for you on [the doorposts of] the houses where you live; when I see the blood I shall pass over you, and no affliction shall happen to you to destroy you when I strike the land of Egypt.

Frontlets

You shall teach them diligently to your children [impressing God’s precepts on their minds and penetrating their hearts with His truths] and shall speak of them when you sit in your house and when you walk on the road and when you lie down and when you get up.

“Therefore, you shall impress these words of mine on your heart and on your soul, and tie them as a sign on your hand, and they shall be as bands (frontals, frontlets) on your forehead.

They do all their deeds to be seen by men; for they make their phylacteries (tefillin) wide [to make them more conspicuous] and make their tassels long.

For by

and the Lord brought us out of Egypt with a mighty hand and with an outstretched arm and with great terror [suffered by the Egyptians] and with signs and with wonders;

General references

And God said, “This is the token (visible symbol, memorial) of the [solemn] covenant which I am making between Me and you and every living creature that is with you, for all future generations;

And you shall bind them as a sign on your hand (forearm), and they shall be used as bands (frontals, frontlets) on your forehead.

Bind them continually upon your heart (in your thoughts),
And tie them around your neck.