Deuteronomy 6:3, 25

Hear therefore, O Israel, and observe to do it; that it may be well with thee, and that ye may increase mightily, as Jehovah, the God of thy fathers, hath promised unto thee, in a land flowing with milk and honey.

And it shall be righteousness unto us, if we observe to do all this commandment before Jehovah our God, as he hath commanded us.