Deuteronomy 11:18-20

Therefore you shall lay up these words of mine in your heart and in your soul. You shall bind them for a sign on your hand, and they shall be for frontlets between your eyes. You shall teach them to your children, talking of them when you sit in your house, when you walk by the way, when you lie down, and when you rise up. You shall write them on the door posts of your house and on your gates