Deuteronomy 11:16-21

Be careful, or you will be fooled and will turn away to serve and worship other gods. If you do, the LORD will become angry with you and will shut the heavens so it will not rain. Then the land will not grow crops, and you will soon die in the good land the LORD is giving you. Remember my words with your whole being. Write them down and tie them to your hands as a sign; tie them on your foreheads to remind you. Teach them well to your children, talking about them when you sit at home and walk along the road, when you lie down and when you get up. Write them on your doors and gates so that both you and your children will live a long time in the land the LORD promised your ancestors, as long as the skies are above the earth.