Exodus 13:9 and Deuteronomy 6:8

It shall be for a sign to you on your hand, and for a memorial between your eyes, that the LORD’s law may be in your mouth; for with a strong hand the LORD has brought you out of Egypt.

Exodus 13:9

You shall bind them for a sign on your hand, and they shall be for frontlets between your eyes.

Deuteronomy 6:8