And this shall serve you as a sign on your hand and as a reminder on your forehead—in order that the Teaching of the LORD may be in your mouth—that with a mighty hand the LORD freed you from Egypt.
Exodus 13:9
“And so it shall be as a sign upon your hand and as a symbol on your forehead that with a mighty hand the LORD freed us from Egypt.”
Exodus 13:16
Bind them as a sign on your hand and let them serve as a symbol on your forehead; inscribe them on the doorposts of your house and on your gates.
Deuteronomy 6:8-9
Therefore impress these My words upon yourvery heart: bind them as a sign on your hand and let them serve as asymbol on your forehead, and teach them to your children—reciting them when you stay at home and when you are away, when you lie down and when you get up; and inscribe them on the doorposts of your house and on your gates— to the end that you and your children may endure, in the land that the LORD swore to your fathers to assign to them, as long as there is a heaven over the earth.
Deuteronomy 11:18-21