Deuteronomy 6:6-9

⁶These words, which I am commanding you today, shall be on your heart. ⁷You shall teach them diligently to your sons and shall talk of them when you sit in your house and when you walk by the way and when you lie down and when you rise up. ⁸You shall bind them as a sign on your hand and they shall be as frontals on your forehead. ⁹You shall write them on the doorposts of your house and on your gates.