New Living Translation
“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.

American Standard Version
And it shall be, if thou shalt forget Jehovah thy God, and walk after other gods, and serve them, and worship them, I testify against you this day that ye shall surely perish.

Berean Study Bible
If you ever forget the LORD your God and go after other gods to worship and bow down to them, I testify against you today that you will surely perish.

Douay-Rheims Bible
But if thou forget the Lord thy God, and follow strange gods, and serve and adore them: behold now I foretell thee that thou shalt utterly perish.

English Revised Version
And it shall be, if thou shalt 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.

King James Bible
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.

World English Bible
It shall be, if you shall forget Yahweh your God, and walk after other gods, and serve them, and worship them, I testify against you this day that you shall surely perish.

Young's Literal Translation
'And it hath been -- if thou really forget Jehovah thy God, and hast gone after other gods, and served them, and bowed thyself to them, I have testified against you to-day that ye do utterly perish;

Deuteronomy 8:19 Additional Translations ...