Deuteronomy 11:16-21

Take heed to yourselves, lest your heart be deceived, and ye turn aside, and serve other gods, and worship them; and the anger of Jehovah be kindled against you, and he shut up the heavens, so that there shall be no rain, and the land shall not yield its fruit; and ye perish quickly from off the good land which Jehovah giveth you. Therefore shall ye lay up these my words in your heart and in your soul; and ye shall bind them for a sign upon your hand, and they shall be for frontlets between your eyes. And ye shall teach them your children, talking of them, when thou sittest in thy house, and when thou walkest by the way, and when thou liest down, and when thou risest up. And thou shalt write them upon the door-posts of thy house, and upon thy gates; that your days may be multiplied, and the days of your children, in the land which Jehovah sware unto your fathers to give them, as the days of the heavens above the earth.