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18“You shall therefore take these words of mine to heart and to soul; and you shall tie them as a sign on your hand, and they shall be as frontlets on your forehead. 19You shall also teach them to your sons, speaking of them when you sit in your house, when you walk along the road, when you lie down, and when you get up. 20And you shall write them on the doorposts of your house and on your gates, 21so that your days and the days of your sons may be increased on the land which the Lord swore to your fathers to give them, as long as the heavens are above the earth.