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.New International Version
If you ever forget the LORD your God and follow other gods and worship and bow down to them, I testify against you today that you will surely be destroyed.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