Deuteronomy 30:8-10

8And thou shalt return and obey the voice of the LORD, and do all his commandments which I command thee this day.

9And the LORD thy God will make thee plenteous in all the work of thine hand, in the fruit of thy body, and in the fruit of thy cattle, and in the fruit of thy ground, for good: for the LORD will again rejoice over thee for good, as he rejoiced over thy fathers:

10if thou shalt obey the voice of the LORD thy God, to keep his commandments and his statutes which are written in this book of the law; if thou turn unto the LORD thy God with all thine heart, and with all thy soul.