if you obey the LORD your God by keeping His commandments and statutes that are written in this Book of the Law, and if you turn to Him with all your heart and with all your soul.
KJV
If thou shalt hearken unto the voice of the LORD thy God, to keep his commandments and his statutes which are written in this book of the law, [and] if thou turn unto the LORD thy God with all thine heart, and with all thy soul.
ASV
if thou shalt obey the voice of Jehovah thy God, to keep his commandments and his statutes which are written in this book of the law; if thou turn unto Jehovah thy God with all thy heart, and with all thy soul.