19 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.

Read Deuteronomy 8:19 Using Other Translations

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.
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.
“But I assure you of this: If you ever forget the LORD your God and follow other gods, worshiping and bowing down to them, you will certainly be destroyed.