Deuteronomy 11:18-19

“Therefore, you shall impress these words of mine on your heart and on your soul, and tie them as a sign on your hand, and they shall be as bands (frontals, frontlets) on your forehead. You shall teach them [diligently] to your children [impressing God’s precepts on their minds and penetrating their hearts with His truths], speaking of them when you sit in your house and when you walk along the road and when you lie down and when you rise up.