You shall therefore keep His statutes and His commandments which I command you today, that it may go well with you and with your children after you, and that you may prolong your days in the land which the LORD your God is giving you for all time."
Deuteronomy 4:40
Surrounding context
4:39 Therefore know this day, and consider it in your heart, that the LORD Himself is God in heaven above and on the earth beneath; there is no other.
4:40 You shall therefore keep His statutes and His commandments which I command you today, that it may go well with you and with your children after you, and that you may prolong your days in the land which the LORD your God is giving you for all time."
4:41 Then Moses set apart three cities on this side of the Jordan, toward the rising of the sun,