Deuteronomy 4:1-2

The Privileges of the Covenant

4:1 Now, Israel, pay attention to the statutes and ordinances I am about to teach you, so that you might live and go on to enter and take possession of the land that the Lord, the God of your ancestors, is giving you. 4:2 Do not add a thing to what I command you nor subtract from it, so that you may keep the commandments of the Lord your God that I am delivering to you.

Deuteronomy 4:40

4:40 Keep his statutes and commandments that I am setting forth today so that it may go well with you and your descendants and that you may enjoy longevity in the land that the Lord your God is about to give you as a permanent possession.