Deuteronomy 32:45-47

And he ended all these words, speaking to all Israel. And he said to them: Set your hearts on all the words, which I testify to you this day: which you shall command your children to observe and to do, and to fulfil all that is written in this law. For they are not commanded you in vain, but that every one should live in them: and that doing them you may continue a long time in the land whither you are going over the Jordan to possess it.