Deuteronomy 11:18

“And it will be as a sign to you on your hand and as a memorial between your eyes, that the law of Yahweh may be in your mouth; for with a strong hand Yahweh brought you out of Egypt.

“These words, which I am commanding you today, shall be on your heart.

“You shall bind them as a sign on your hand, and they shall be as phylacteries between your eyes.

Do not let lovingkindness and truth forsake you; Bind them around your neck, Write them on the tablet of your heart.

Bind them on your fingers; Write them on the tablet of your heart.

and I will give them one heart and one way, that they may fear Me always, for their own good and for the good of their children after them.

“But they do all their deeds to be noticed by men; for they broaden their phylacteries and lengthen the tassels of their garments.