King James Version
And it shall be, if thou do at all forget the LORD thy God, and walk after other gods, and serve them, and worship them, I testify against you this day that ye shall surely perish.English Standard Version
And if you forget the LORD your God and go after other gods and serve them and worship them, I solemnly warn you today that you shall surely perish.Catholic Public Domain Version
But if you forget the Lord your God, so that you follow foreign gods, and serve and adore them: behold, I now foretell to you that you shall utterly perish