Deuteronomy 6:6-8

6And athese words that I command you today shall be on your heart. 7 bYou shall teach them diligently to your children, 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. 8 cYou shall bind them as a sign on your hand, and they shall be as frontlets between your eyes.
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