Deuteronomy 30:10

30:10 if you shall obey the voice of Yahweh your God, to keep his commandments and his statutes which are written in this book of the law; if you turn to Yahweh your God with all your heart, and with all your soul.
-World English Bible

Other Translation

30:10 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.
-King James Version