Deuteronomy 32:45-47

Moses finished speaking all these words to all Israel, and he said to them: “Set your hearts on all the words which I testify among you today, which you shall command your children to be careful to observe—all the words of this law. For it is not a futile thing for you, because it is your life, and by this word you shall prolong your days in the land which you cross over the Jordan to possess.”